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Topic: How much oil does your duramax use?

Posted By: Jetstreamer on 09/15/10 05:46pm

We bought a real nice 2004.5 Chevy diesel with 75K miles and I would like to get a feel for what I can expect to see for oil consumption...Also, the truck is only used for pulling a trailer so would I necessarily see a higher rate of oil usage?..Thanx!

* This post was edited 09/15/10 08:04pm by Jetstreamer *


Posted By: crickeydog on 09/15/10 05:56pm

I only change the oil in our D/A every 20K as I have installed an FS2500 dual oil filter system but, I can tell you that since the last oil change 16K ago I've only had to add just a quart. I'm not sure which generation Duramax engine you have in your '04 but I have the LBZ engine.

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* This post was edited 09/15/10 06:07pm by crickeydog *


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Posted By: Rod Wise on 09/15/10 06:08pm

I change mine by the computer, usually around 8-9000 mile. Usually uses 1 or 2qt in that time period. My 03 was the same way.


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Posted By: Reader1 on 09/15/10 06:18pm

Our Silverado Duramx is a 2004 with 132,000 miles. DH changes the oil by the computer. He says it is an expensive engine and he is not going to "play with it." DH recommends that you change the fuel filter every 10,000 miles. (After ours went out while camping, he keeps a spare oil filter and filter wrench with us.)


Posted By: DutchmenSport on 09/15/10 06:22pm

I've never 'added' oil in mine between oil changes. I watch the meter that give the "oil life percentage". When it reaches 1%, I get an oil change. It takes 10 quarts for a change with the oil filter.


Posted By: Scarface56 on 09/16/10 07:38am

I have never had to add oil between oil changes. I use Rotella 15-40 and change it every 5000 miles. I change the fuel filter every 10,000 miles and the transmission filter every 25,000 miles. My truck is stock and it will stay that way.


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Posted By: RockRiver on 09/15/10 07:46pm

I use Chevron Delo 15w-40 in all of my diesel engines. UPS also uses Delo in all their trucks. I have owned several dMax's, Ford, Cummins. I farm & ranch for a living, and have John Deere, CAT, & Perkins engines.

In my p/ups, I change the oil at 5000 miles. I do not add any oil between changes (but honestly, it would not really worry me if I had to add up to a quart between changes).
My tractors get changed at either 100 or 200 engine hours, depending on which tractor we're talking about. I have not bought into the synthetic engine oil because I have gotten along tooo good for tooo long with my current maintenance routine. I'm not trying to get into a war, and I'm sure the AmsOils & synthetics are good--it's just not for me. I have never had ~any~ engine trouble whatsoever. I have some tractors with over 10,000 engine hours, still on the original pistons & rings, so there can't be too much wrong with what we're doing.
I believe regular service intervals are the key to long life because when you drain the oil, you drain the contaminants that were in the oil. Oil does not lose it's "slick" per se, but it does build up with contaminants.

My advice to you would be to consult your owner's manual as to which viscosity of oil to use, especially up there in those cold Wisconsin winters. GM may want you to use something thinner than 15w-40 in the winter. Try not to think too much into it...these days there are so many options and ways to go pertaining to oil (and maintenance in general), and most are more costly than they should be. Just keep it simple, stick to the basics, use quality oil, and drop it at regular intervals.

If your dMax is an early '04, then your engine series is LB7. If your truck is a 2004.5, then your engine series is LLY. Both are great engines, and 75k miles is just "wore in good" IF it was maintained well by the previous owner(s). My current dMax is a '07 LBZ, and it is considered by some to be the crown jewel of the dMax series.

A good Forum to learn more about dMax is here:
THE DIESEL PLACE FORUM
There is a wealth of information on sites like I've mentioned above. TONS of good reading on maintenance, trouble shooting, modifications, etc.

I wish you well.


2007 Chevrolet dMax/Allison(LBZ), one ton, dually, crew cab w/PPE Standard
2003 Holiday Rambler Alumiscape, 34'



Posted By: 1100Sabre on 09/15/10 07:53pm

We have an '09 Duramax and it gets an oil change every 5,000 miles. We have 44,000 miles on it and we have never had to add any oil to it between changes. It never even drops off of the full mark either. Our '06 had the 6.0L gas engine and it was the same way, every 5,000 miles and never used a drop.


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Posted By: Turtle n Peeps on 09/15/10 08:05pm

I put 10 qts in and after 10K miles, 10 qts come out. I don't add a drop. This is on my 06 LBZ.


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Posted By: CND SuperCrew on 09/15/10 08:30pm

I change mine when the DIC tells me to. At 6000 kms I changed the filter and topped it off, still at 30% with 13000km on it. Checked it the other day and it is just below the full mark. I'm also using Amsoil 5-40, I've only had the truck for 11 months also.


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Posted By: RVMN on 09/15/10 08:38pm

I usually add 1 qt. between 5000 mile changes. I don't like that, but it is my only complaint about this otherwise flawless motor.


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Posted By: CKNEK on 09/15/10 09:02pm

Change mine every 6K (10kms for Canadians) and the level usually drops about 1/4" on the dipstick. It has consistently done this since new and I don't bother adding between oil changes.


07 GMC CCSB LBZ Duramax with a few goodies.


Posted By: glazier on 09/15/10 10:31pm

I change mine every 7500 miles, and never have to add oil between changes.


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Posted By: daireemt on 09/15/10 11:55pm

We have a 2004.5 (LLY) It has 70,000 miles on it and I have not ever added oil to it between oil/filter changes. Oil & filter are changed when oil life system sends message.


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Posted By: Tystevens on 09/16/10 10:55am

Re: oil usage (which I believe was the OP's question) -- I've only had the truck since February, but my observation so far is that it doesn't burn any unloaded, burns a surprising amount towing. It had a fresh change from the dealer when I bought it (Delo 15-40, I believe), filled to the top line. Didn't budge from Feb. to May, and I checked it every few tanks 'cause I'd read that the Duramax can use a little oil. Started towing in May, and it burned about 2.5 qts over the summer, including about 1.5 qts on a long, windy, hot, mountainous 2200 mile trip from SLC, Utah to Oregon Coast to No. Cal. mountains and back. I changed the oil in mid-August, and we have only been out on a couple short trips since (we are expecting a baby any day, so my wife hasn't been in the camping mood lately!), it appears to have used just a bit -- down about 1/2 line from the top hashmark.

The spec on this engine is usage of 1 qt per 100 gallons, I believe, so my oil usage isn't beyond GM's expectations. But it was surprising to me, as I haven't had a vehicle that used a drop of oil for years -- I'd gotten quite out of the practice of checking it! This is the one issue about this engine that I'm less than ecstatic about -- I didn't think I'd have to carry oil on long trips (and I guess I don't, but I have to make sure its full when I leave and refill it when I get home). But it's a minor inconvenience.

Also, those of you who mentioned the DIC know that it wont tell you if the oil is low, right? You still have to get out and pull the dipstick (or cable in this case, I guess).

RE: timing of oil changes, I do it when the DIC tells me to. Went 9900 miles on my first change. I replaced the Delo with synthetic Rotella T6. I'm curious to see if the synthetic oil resists burning any better than the dino oil did.


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Posted By: ib516 on 09/16/10 12:50pm

Off topic, but you might want to do some reading here.

http://www.dieselplace.com/forum/showthread.php?t=370357


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Posted By: larry barnhart on 09/16/10 02:12pm

No oil used for us and no overheating either. Giving it a long test Tuesday and home in April.
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Posted By: UsualSuspect on 09/16/10 03:20pm

If I am towing in the heat, 2 quarts between 10K changes. GM's policy is 1 qt per thousand miles. I have not seen one use that much, so GM is just covering all the bases.


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Posted By: bkellerman on 09/16/10 05:21pm

Anyone know what the DIC is telling us? Is it the mileage that is on the oil or the condition of the oil like the Viscosity, cleanliness, etc..


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Posted By: glazier on 09/16/10 05:26pm

I have owned several GM vehicles (still do) and have never had a truck, car, or SUV that used oil in between changes. A big Knock on Wood for me I guess, but 1 quart per 1000 miles seems a bit much for any light duty vehicle.


Posted By: mtofell1 on 09/16/10 05:28pm

Dale_S wrote:

If I am towing in the heat, 2 quarts between 10K changes. GM's policy is 1 qt per thousand miles. I have not seen one use that much, so GM is just covering all the bases.


Something there isn't right.... that would be 10 quarts every 10k miles.

I've seen a spec from GM and I believe it has to do with gallons of fuel used. Maybe 1 quart per 1000 gallons of fuel or something like that.


Posted By: Tystevens on 09/16/10 06:00pm

bkellerman wrote:

Anyone know what the DIC is telling us? Is it the mileage that is on the oil or the condition of the oil like the Viscosity, cleanliness, etc..


DIC is just an algorithm including mileage, engine rotations, engine temps, and a few other metrics. It doesn't actually measure the oil in any way.


Posted By: Ezlife55 on 09/16/10 09:51pm

Dmax's are known for not using oil....the exception being when the oil is run right to the end of it's 'life' according to the DIC...there'll likely be some consumption of dirty oil especially if towing.
I have an 04 with 90K miles. Up to about 65K miles the oil stayed clean ( didn't blacken as I change every 3000 miles with a usual remaining oil life around 75%).
But I was on a trip 2 years ago and put on about 5500 miles with 57% oil life remaining at the change-it was black. I'm working my way back to clean-right now I have 1500 miles on the oil and it's clean at 92% oil life remaining. It won't be totally clean, but it won't be black at my next change at 3000 miles next month.
Oil level never moves even if towing the whole oil change interval.


Posted By: ktmrfs on 09/16/10 10:54pm

I've got 85K on my 04.5. Use synthetic oil and change it every 10K miles. never has used more than maybe 1/2 qt. in 10K miles, usually so little you can't tell if it's moved, way less than a pint.


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Posted By: ktmrfs on 09/16/10 11:00pm

Tystevens wrote:

bkellerman wrote:

Anyone know what the DIC is telling us? Is it the mileage that is on the oil or the condition of the oil like the Viscosity, cleanliness, etc..


DIC is just an algorithm including mileage, engine rotations, engine temps, and a few other metrics. It doesn't actually measure the oil in any way.


Correct, but is does appear to be a pretty good algorithm. It also doesn't have any way to distinguish between use of conventional or synthetic oils.
My experience is that it is also VERY conservative in indicating when oil needs to be changed. If it tells me to change at 8K miles, an oil analysis including TBN has indicated I could easily go well beyond that, maybe double or more. So I just change it at 10K miles which is when it typically says I'm due.


Posted By: ktmrfs on 09/16/10 11:05pm

mtofell1 wrote:

Dale_S wrote:

If I am towing in the heat, 2 quarts between 10K changes. GM's policy is 1 qt per thousand miles. I have not seen one use that much, so GM is just covering all the bases.


Something there isn't right.... that would be 10 quarts every 10k miles.

I've seen a spec from GM and I believe it has to do with gallons of fuel used. Maybe 1 quart per 1000 gallons of fuel or something like that.


the 1gt/800-1000 miles is pretty standard for most every car mfg today as a limit for oil consumption warranty claims. Anything less than 1qt/1000 miles is considered "acceptable" at least from any warranty work. doesn't mean that is what you should expect or be satistifed with by any means.


Posted By: sc3283 on 09/16/10 11:05pm

I change every 5k, no matter how much towing during that period...and never have had to add any..Mine is an LLY, 67k miles


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Posted By: bkellerman on 09/17/10 06:35am

I change the oil every 3000 - 4000 when I do some heavy towing in hot weather. When not towing for a long time I may go 5000 - 6000 miles between changes.


Posted By: Scarface56 on 09/17/10 06:49am

I have to ask how long are you waiting after you turn your truck off before checking the oil level. It takes awhile before all the oil drains back into the pan. It is more accurate to check the oil level while the engine is cold or has set for awhile.


Posted By: Tystevens on 09/17/10 09:04am

Ezlife55 wrote:

Dmax's are known for not using oil....the exception being when the oil is run right to the end of it's 'life' according to the DIC...there'll likely be some consumption of dirty oil especially if towing.
I have an 04 with 90K miles. Up to about 65K miles the oil stayed clean ( didn't blacken as I change every 3000 miles with a usual remaining oil life around 75%).
But I was on a trip 2 years ago and put on about 5500 miles with 57% oil life remaining at the change-it was black. I'm working my way back to clean-right now I have 1500 miles on the oil and it's clean at 92% oil life remaining. It won't be totally clean, but it won't be black at my next change at 3000 miles next month.
Oil level never moves even if towing the whole oil change interval.


Not to argue with you, but most of the Duramax forums I frequent would argue that Duramaxes are known to use a bit of oil. Nothing uncommon about a Duramax using 2-3 qts over the life of an oil change, especially if it is used to tow a lot. Post this question over at dieselplace or somewhere like that, and I'll bet that 1/2 of those that respond use some oil between changes.

Also, I've never seen a diesel that didn't make the oil black within a day or 2. Mine certainly is. 3000 miles on clear oil is certainly uncommon.


Posted By: Delaine and Lindy on 09/19/10 08:40am

If your changing oil in a Duramax every 5,000 miles your wasting your money. Have owned many Duramax's and never ever changed the oil before 10,000 miles. I did change my own oil in the Duramax Trucks I had owned. However due to 7 gals to change oil in the Mercedes in the Freightliner I now have it done. Just to much trouble to get ride of the old oil. Oh by the way never had to add oil to the Duramax. But its your money if you want to change oil at 5,000 miles do it. GBY.....


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Posted By: UsualSuspect on 09/19/10 11:42am

mtofell1 wrote:

Dale_S wrote:

If I am towing in the heat, 2 quarts between 10K changes. GM's policy is 1 qt per thousand miles. I have not seen one use that much, so GM is just covering all the bases.


Something there isn't right.... that would be 10 quarts every 10k miles.

I've seen a spec from GM and I believe it has to do with gallons of fuel used. Maybe 1 quart per 1000 gallons of fuel or something like that.

When I am towing I get anywhere between 10 and 13 MPG, so if you go to GM and complain about excessive oil consumption they will pull the stats out of the trucks computer, as I did this morning. The stats will tell them what happened in the last 10K when it comes to fuel mileage, and there are some stats that never go away (Highest speed mark, Torque, highest engine temp, etc). On mine, with the Tech II scanner, it shows my lowest MPG was .3, and the highest was 18.6 in the last 10K. The .3 according to it was for 21 minutes. Now that they have that information, I would probably be denied any claim. They do use mileage, but GM knows if you are towing what the average fuel consumption is (GM assumes it is 8-12 MPG from their internal testing). GM's position is 1 qt. of oil per 100 gallons fuel, so 1 qt every 1,000 miles in GM's eyes is acceptable towing. Have I ever seen one use that much? Yes, but it needed new valve guides. So will you probably not see that much, not unless something is wrong.
Here is the TSB from GM:
Diesel Engine - Greater Than Expected Oil Consumption

Bulletin No.: 02-06-01-027A

Date: May 17, 2005

INFORMATION

Subject:
Information on Higher Than Expected Oil Consumption

Models:
2001-2006 Chevrolet Silverado 2500-3500 Series Models
2006 Chevrolet Express 2500-3500 Series Models
2001-2006 GMC Sierra 2500-3500 Series Models
2006 GMC Savana 2500-3500 Series Models
2003-2006 Chevrolet Kodiak C4500-C5500 Series Models
2003-2006 GMC Topkick C4500-C5500 Series Models

with 6.6L Duramax(TM) Diesel Engine (VINs 1, 2 - RPOs LB7, LLY)

Supercede:

This bulletin is being revised to add models and model years. Please discard Corporate Bulletin Number 02-06-01-027 )Section 06 - Engine/Propulsion System).

Information on Engine Oil Consumption Guidelines for the 6.6L Duramax Diesel Engine.

All engines require oil to lubricate and protect the load bearing and internal moving parts from wear including cylinder walls, pistons and piston rings. When a piston moves down its cylinder, a thin film of oil is left on the cylinder wall. During the combustion process, part of this oil layer is consumed. As a result, varying rates of oil consumption are accepted as normal in all engines.

Oil Consumption

Oil usage has a direct relationship with the amount of fuel used. The harder an engine works, the more fuel and oil it will use. Therefore, oil usage as a factor of fuel usage is a more accurate indicator of acceptable oil consumption levels than vehicle mileage.

The accepted rate of oil consumption for the 6.6L Duramax(TM) Diesel engine is 0.946 liter (1 qt) within 379 liters (100 gallons) of fuel used. This rate only applies to vehicles under warranty, maintained in accordance with the appropriate maintenance schedule, driven at legal speeds and within design intent of the vehicle.

Many factors can affect an owner's concern with oil consumption. Driving habits and vehicle maintenance vary from owner to owner. Thoroughly evaluate each case before deciding whether the vehicle in question has abnormal engine oil consumption.

Gasket and External Leaks

Inspect the oil pans, engine covers, and the engine oil cooler for leakage. Inspect the turbocharger oil lines and fittings for signs of leakage. Inspect the turbocharger outlet pipe for signs of oil, indicating worn turbocharger shaft bushings or seals. Inspect for oil leakage into the engine coolant.

Improper Reading of the Oil Level Indicator (Dipstick)

The vehicle must be parked on a level surface to obtain accurate oil level readings. Verify that the dipstick tube is fully seated in the block. When checking the oil level, make sure the dipstick is wiped clean before taking an oil level reading and fully depress the dipstick until the shoulder bottoms out on the dipstick tube. The dipstick should be the proper part number for the engine/vehicle that is being checked.

Not Waiting Long Enough After Running Engine to Check Oil Level

The vehicle should be allowed to sit for at least 15 minutes, after the engine has been shut off, before taking an oil level reading to assure the oil has had enough time to drain back into the crankcase. In order to ensure accurate results, the temperature of the oil should be close to the same temperature as the last time the oil level was checked.

Improper Oil Fill After an Oil Change

Following an oil change, verify that the proper amount and type of oil was put in the engine and that the oil level on the dipstick is not above the full mark or below the add marks. Refer to the Owner's Manual or Service Manual for information on recommended oil quantity, viscosity, and quality. Diesel engines require a CH-4 or CG-4 oil rating.

High Speed or High RPM Driving

Continuous driving at high speeds/high RPMs may increase oil consumption. Because this may not always be an everyday occurrence, it is hard to determine exactly how much the oil economy will be affected.

Towing or Heavy Usage

Towing a trailer or hauling additional weight will increase oil consumption. Large frontal area trailers will further increase the work required from the engine, especially at highway speeds, and thus increases the rate of oil consumption.

PTO Operation

Operation of a PTO will increase fuel and oil usage, as the PTO driven accessory uses engine power to operate.

Crankcase Ventilation System

Verify that the positive crankcase ventilation (PCV) system is operating properly. Blockages, restrictions or damage to the PCV system can result in increased oil use.

Oil Dilution from Condensation

On vehicles that are usually driven short distances, less than 8 km (5 mi), especially in colder weather, condensation generated from cold engine operation may not get hot enough to evaporate out of the oil. When this occurs, the dipstick may indicate that the oil level is over-full. Subsequent driving on a trip of sufficient length to enable normal engine operating temperature for 30 minutes or more, in order to vaporize excess moisture, may give the customer the impression of excessive oil consumption.

Engine Temperature

If an engine is run at overheated temperatures (see Owner's Manual or Service Manual) for more than brief periods, oil will oxidize at a faster than normal rate. In addition, gaskets may distort, piston rings may stick, and excessive wear may result. verify that all cooling system components are in proper working order.

Engine Wear

Piston scuffing, excessive piston-to-wall clearance, tapered or out of round cylinders, worn, damaged or improperly installed valve guides, seals and piston rings will all cause an increase in oil consumption.

Measurement of Oil Consumption

Engines require a period of time to BREAK IN so that moving parts are properly seated. Therefore, oil economy should not be tested until the vehicle has accumulated at least 8000 km (5000 mi) and the oil has been changed for the first time. During initial engine break-in periods before the first oil change, oil consumption may exceed 1.9 liters (2 quarts) or more per 379 liters (100 gallons) of fuel used.

1. Verify that the engine has no external leaks. Repair as necessary.

2. Begin oil consumption test after next regularly scheduled oil and filter change. Oil changes should not be performed during the test.

3. Verify that the engine is at normal operating temperature (see Owner's Manual or Service Manual).

4. Park the vehicle on a level surface.

5. Wait at least 15 minutes, after the engine is shut off, before checking the oil level to make sure that most of the oil has had time to drain back into the crankcase.

6. Verify that the oil level is at, but not above, the full mark on the dipstick and that the proper viscosity and quality oil are being used as recommended in the Owner's Manual.

7. Dealer should record the vehicle mileage, date and engine hours at the start of the test on the Oil Consumption Worksheet shown.

8. Ask the customer to verify and record the date, odometer, oil level, fuel added, and engine hours, each time the vehicle is fueled, following steps 3-5 and return the vehicle to the dealership if the oil level is found at or below the add mark, 0.946 liter (1 qt) low, if possible. The dealer will add oil to return the oil level to full. If the oil level remains above the add mark, the customer should continue to operate the vehicle and verify the engine oil level until either the oil level drops to or below the add mark or at least 4800 km (3000 mi) has accumulated since the test began before returning to the dealership for a final evaluation.

9. If the final evaluation shows that the engine uses more than 0.946 liter (1 qt) in 379 liters (100 gallons) of fuel used, follow the published symptom diagnostics as described in the appropriate Service Manual. If the oil consumption test shows that the engine uses less than 0.946 liter (1 qt) in 379 liters (100 gallons) of fuel used, explain to the customer that their engine meets the guidelines for oil consumption.

Here is the update GM published to include the LBZ's and LMM's:

Document ID: 1343441
This document is an addendum to Bulletin Number 02-06-01-027A to add additional RPO Codes LBZ and LMM
Oil Consumption Diagnosis
The accepted rate of oil consumption, not due to leaks, is the use of 0.946 liter (1 qt) or less within 379 liters (100 gallons) of fuel used. This rate only applies to vehicles under warranty, maintained in accordance with the appropriate maintenance schedule, driven at legal speeds and within design intent of the vehicle.
Oil economy should not be tested until the vehicle has accumulated at least 8000 km (5000 mi) and the oil has been changed for the first time. During initial engine break-in periods before the first oil change, oil consumption may exceed 1.9 liters (2 qts) or more per 379 liters (100 gallons) of fuel used.
Checks
Causes
Preliminary
The causes of excessive oil consumption may include the following conditions:
• External oil leaks
Refer to Oil Leak Diagnosis.
• Incorrect oil level or improper reading of the oil level indicator
With the vehicle on a level surface, run the engine for a few minutes, allow adequate drain down time (2-3 minutes) and check for the correct engine oil level.
• Improper oil viscosity
Refer to the vehicle owners manual and use the recommended SAE grade and viscosity for the prevailing temperatures.
• Continuous high speed driving and/or severe usage
• Crankcase ventilation system restrictions or malfunctioning components
• Oil residue in the charge air cooler system is normal with a closed PCV system
• Worn valve guides and/or valve stems
• Worn or improperly installed valve stem oil seals
• Piston rings broken, worn, not seated properly
Allow adequate time for the rings to seat.
Replace worn piston rings as necessary.
• Piston and rings improperly installed or improperly fit to the cylinder bore


Posted By: Randy from Utah on 09/19/10 12:57pm

Boy,
With those specs, it makes the Ram Cummmings more attractive to buy.
I qt.in in 1000 miles does seem alot to me.JMHO

later..Randy


1996 Dodge Laramie 4X4.
2500 V10 R47H
1999 Fleetwood Terry 275J EX


Posted By: blt2ski on 09/19/10 02:21pm

I used to do 1qt per 1000 with my GM 6.5td, and about that with my 92 IHC and an IDI 7.3 when pulling hard etc. I think I have had to add maybe 3 qts over 105K miles.......other than oil changes.

I have not heard of any complaints if you will about the dmax being a wet motor, ie higher oil usage. Unlike the 6.5 or 454's of old, those used 1 qt per 1000 miles with out fail!

marty


92 Navistar dump truck, 7.3L 7 sp, 4.33 gears with a Detroit no spin
00 Chev C2500, V5700, 4L80E, 4.10, base truck, no options!
92 Red-e-haul 12K equipment trailer

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Posted By: ib516 on 09/20/10 10:35am

I find that interesting. My Cummins pulls heavy and never uses any oil that I can tell on the dipstick, and I guess that would be less than half a quart/litre in 7500 miles. Different design I guess??


Posted By: fbergski on 09/20/10 01:09pm

This summer I did a 4,000 mile trip in two weeks, used one quart of oil. Most highways speeds I was over 80 mph. When not doing trips like this I use no oil. Not sure if the sustained 2100 rpms makes a difference or not.

Philip


Posted By: Charlie D. on 09/20/10 03:35pm

Looks like answers are all over the place.

60,900 miles and about 26,800 towing. Oil change every 7,000 miles. Never moves off full.


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Posted By: glazier on 09/20/10 05:16pm

Delaine and Lindy wrote:

If your changing oil in a Duramax every 5,000 miles your wasting your money. Have owned many Duramax's and never ever changed the oil before 10,000 miles. I did change my own oil in the Duramax Trucks I had owned. However due to 7 gals to change oil in the Mercedes in the Freightliner I now have it done. Just to much trouble to get ride of the old oil. Oh by the way never had to add oil to the Duramax. But its your money if you want to change oil at 5,000 miles do it. GBY.....


Good post


Posted By: rkassl on 09/23/10 04:46pm

My 2004.5 LLY is used for towing. We have 80000 miles on it, have always used synthetic oil change every 5000 miles, regardless of computer. Never have added oil between changes, did mountains and deserts last year. Great motor!


2015 Montana 3440RL Legacy Edition
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Posted By: RedG on 09/23/10 05:34pm

My 07 LBZ with 35k miles uses a little but usually not enough to add any between changes. It seems to use it mostly if I do a lot of 70 mph (or above) long range driving. I think it's probably the turbo sucking it through the pcv.


2005 Newmar Dutch Star 4024 DP 370 Cummins
Towing my 2012 Malibu w/Blue Ox towbar & Patriot brake system



Posted By: 45Ricochet on 09/23/10 08:27pm

I had no idea DMAX used oil. Mine has never used or made oil. I guess we're all nuts for not buying a Ford.


2015 Tiffin Phaeton Cummins ISL, Allison 3000, 45K GCWR
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2015 GMC Canyon Toad

Previous camping rig
06 Ram 3500 CC LB Laramie 4x4 Dually 5.9 Cummins Smarty Jr 48RE Jacobs brake
06 Grand Junction 15500 GVWR 3200 pin



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