Good Sam Club Open Roads Forum: 5W40 or 15W40 in 6.7 CTD?
Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Posting Help and Support  |  Contact  

Search:   Advanced Search

Search only in Tow Vehicles

Open Roads Forum  >  Tow Vehicles

 > 5W40 or 15W40 in 6.7 CTD?

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 6  
Prev  |  Next
mr61impala

Versailles Ky USA

Senior Member

Joined: 01/21/2007

View Profile



Good Sam RV Club Member

Offline
Posted: 11/01/20 05:04am Link  |  Quote  |  Print  |  Notify Moderator

Let me preface this by saying this is NOT a recommendation.

I recently retired from UPS in the Automotive department, 9 years as a diesel mechanic and the rest of my career managing the shops.

UPS has the largest privately owned fleet of vehicles in the world so cost is a huge factor, I am going to tell you something you will not believe but trust me, it's true.

Around 20010, in an effort to reduce costs and after discussions with the various suppliers, UPS decided to use 10w30 exclusively in all delivery vehicles. Cummins was one of our suppliers who signed off on this decision.

We have been running 10w30 in all 5.9 and 6.7L Cummins, with a 15,000 oil drain interval since that time with no ill effects. Read that again. Most 6.7L engines exceed 500K miles with only water pump, turbo, injector, EGR valve and maybe EGR cooler replacement. I know of one in particular with over 600k miles that still only consumes 2 qts of 10w30 between those 15,000 mile oil changes.

The primary cause of CTD failure is injector failure, stripping the cylinder walls of lubricant. If it starts missing or smoking SHUT IT OFF until the cause is corrected.

Again this is not a recommendation, just interesting results of a huge real world reality.


Shopping for Travel Trailer

rhagfo

Portland, OR

Senior Member

Joined: 07/06/2012

View Profile



Good Sam RV Club Member

Offline
Posted: 11/01/20 06:17am Link  |  Quote  |  Print  |  Notify Moderator

blofgren wrote:

rhagfo wrote:

otrfun wrote:

If Ram didn't require a 6-mo. OCI (truck's still under warranty), we'd probably use 5w-40 (3 gal. ~$60). However, we can't justify the extra expense for synthetic every 6-mo. Only put about 5k - 6k mi. on the truck between each 6 mo. oil change. We typically use whatever brand of API CK-4, 15w-40 that's on sale at Sam's Club or Costco (3 gal. ~$30).


Well even if it is a bit more I like to be constant with the oil I put in my engines, and like it to be good quality.
This is part of the reason why, this is the tappet gallery on our 2001 Ram CTD at 300,000 miles.

[image]


Wow, that looks great! I only use top quality oil as well along with OEM filters in all of my vehicles.


I order my filters from Geno's Garage, yea they take a week to get here, but I order replacements when I use the ones I have, just in case I get some bad fuel.


Russ & Paula the Beagle Belle.
2016 Ram Laramie 3500 Aisin DRW 4X4 Long bed.
2005 Copper Canyon 293 FWSLS, 32' GVWR 12,360#

"Visit and Enjoy Oregon State Parks"


ShinerBock

SATX

Senior Member

Joined: 02/22/2015

View Profile



Posted: 11/01/20 08:52am Link  |  Quote  |  Print  |  Notify Moderator

mr61impala wrote:

Let me preface this by saying this is NOT a recommendation.

I recently retired from UPS in the Automotive department, 9 years as a diesel mechanic and the rest of my career managing the shops.

UPS has the largest privately owned fleet of vehicles in the world so cost is a huge factor, I am going to tell you something you will not believe but trust me, it's true.

Around 20010, in an effort to reduce costs and after discussions with the various suppliers, UPS decided to use 10w30 exclusively in all delivery vehicles. Cummins was one of our suppliers who signed off on this decision.

We have been running 10w30 in all 5.9 and 6.7L Cummins, with a 15,000 oil drain interval since that time with no ill effects. Read that again. Most 6.7L engines exceed 500K miles with only water pump, turbo, injector, EGR valve and maybe EGR cooler replacement. I know of one in particular with over 600k miles that still only consumes 2 qts of 10w30 between those 15,000 mile oil changes.

The primary cause of CTD failure is injector failure, stripping the cylinder walls of lubricant. If it starts missing or smoking SHUT IT OFF until the cause is corrected.

Again this is not a recommendation, just interesting results of a huge real world reality.


This is kind of apples and oranges in terms of use. The reason why Cummins signed off on 10w30 for your trucks and many other applications likes it is due your constant stop/starts. Constant stop/starts is not good on many engine parts and adds a lot of wear to cylinder sleeves. Oil recommendations are generally based on applications and a UPS truck application is not the same as most personal use trucks.

FishOnOne

The Great State of Texas

Senior Member

Joined: 02/12/2011

View Profile


Offline
Posted: 11/01/20 09:40am Link  |  Quote  |  Print  |  Notify Moderator

ShinerBock wrote:

mr61impala wrote:

Let me preface this by saying this is NOT a recommendation.

I recently retired from UPS in the Automotive department, 9 years as a diesel mechanic and the rest of my career managing the shops.

UPS has the largest privately owned fleet of vehicles in the world so cost is a huge factor, I am going to tell you something you will not believe but trust me, it's true.

Around 20010, in an effort to reduce costs and after discussions with the various suppliers, UPS decided to use 10w30 exclusively in all delivery vehicles. Cummins was one of our suppliers who signed off on this decision.

We have been running 10w30 in all 5.9 and 6.7L Cummins, with a 15,000 oil drain interval since that time with no ill effects. Read that again. Most 6.7L engines exceed 500K miles with only water pump, turbo, injector, EGR valve and maybe EGR cooler replacement. I know of one in particular with over 600k miles that still only consumes 2 qts of 10w30 between those 15,000 mile oil changes.

The primary cause of CTD failure is injector failure, stripping the cylinder walls of lubricant. If it starts missing or smoking SHUT IT OFF until the cause is corrected.

Again this is not a recommendation, just interesting results of a huge real world reality.


This is kind of apples and oranges in terms of use. The reason why Cummins signed off on 10w30 for your trucks and many other applications likes it is due your constant stop/starts. Constant stop/starts is not good on many engine parts and adds a lot of wear to cylinder sleeves. Oil recommendations are generally based on applications and a UPS truck application is not the same as most personal use trucks.


For '19-'20 6.7 Cummins with the hydraulic lifters require 10W30 or 5W40 oils and have moved away from 15W40 oils. Some who have ran 15W40 in these trucks have reported rattling or knocking noises.


'12 Ford Super Duty FX4 ELD CC 6.7 PSD 400HP 800ft/lbs
"200k Mile Club"
'16 Sprinter 319MKS "Wide Body"


FishOnOne

The Great State of Texas

Senior Member

Joined: 02/12/2011

View Profile


Offline
Posted: 11/01/20 09:45am Link  |  Quote  |  Print  |  Notify Moderator

rhagfo wrote:

blofgren wrote:

rhagfo wrote:

otrfun wrote:

If Ram didn't require a 6-mo. OCI (truck's still under warranty), we'd probably use 5w-40 (3 gal. ~$60). However, we can't justify the extra expense for synthetic every 6-mo. Only put about 5k - 6k mi. on the truck between each 6 mo. oil change. We typically use whatever brand of API CK-4, 15w-40 that's on sale at Sam's Club or Costco (3 gal. ~$30).


Well even if it is a bit more I like to be constant with the oil I put in my engines, and like it to be good quality.
This is part of the reason why, this is the tappet gallery on our 2001 Ram CTD at 300,000 miles.

[image]


Wow, that looks great! I only use top quality oil as well along with OEM filters in all of my vehicles.


I order my filters from Geno's Garage, yea they take a week to get here, but I order replacements when I use the ones I have, just in case I get some bad fuel.


Not sure Delo is performing exceptional here with the black residue build up on the push rods. Can only imagine that black build up behind the ring lands.

Grit dog

Black Diamond, WA

Senior Member

Joined: 05/06/2013

View Profile


Offline
Posted: 11/01/20 09:52am Link  |  Quote  |  Print  |  Notify Moderator

Fish, Shiner, don’t fall into the consummate antagonist trap like a lot of the members here.
The UPS example is plain and simple and example of it doesn’t matter if you overchange and run boutique oils.
And the 300k example is just that. 300k, looks pretty clean, runs good and all that on “cheap” oil.
Cmon guys. Give a little credit where due once in a while. I know you’re a couple of the sharper guys on here.


"Yes Sir, Oct 10 1888, Those poor school children froze to death in their tracks. They did not even find them until Spring. Especially hard hit were the ones who had to trek uphill to school both ways, with no shoes." -Bert A.

ShinerBock

SATX

Senior Member

Joined: 02/22/2015

View Profile



Posted: 11/01/20 10:28am Link  |  Quote  |  Print  |  Notify Moderator

FishOnOne wrote:


For '19-'20 6.7 Cummins with the hydraulic lifters require 10W30 or 5W40 oils and have moved away from 15W40 oils. Some who have ran 15W40 in these trucks have reported rattling or knocking noises.


I haven't heard about knocking or rattling noises on a new 6.7L due to using 15w40. Although, it would have to be pretty pronounced since the 6.7L is a fairly loud engine and 15w40 has the same viscosity grade as 5w40 at operating temp.

Most engine manufacturers are going to lighter engine oils due to fuel economy concerns. The hydronic lifters may have something to do with as well, but the main reasons for this shift is likely due to the upcoming CAFE fuel economy standards that include all classes into the average instead of just class 1-2A. Every little bit counts and even small gains with keep them from paying millions in fines.

Cummins12V98

on the road

Senior Member

Joined: 06/03/2012

View Profile


Offline
Posted: 11/01/20 11:20am Link  |  Quote  |  Print  |  Notify Moderator

rhagfo wrote:

blofgren wrote:

rhagfo wrote:

otrfun wrote:

If Ram didn't require a 6-mo. OCI (truck's still under warranty), we'd probably use 5w-40 (3 gal. ~$60). However, we can't justify the extra expense for synthetic every 6-mo. Only put about 5k - 6k mi. on the truck between each 6 mo. oil change. We typically use whatever brand of API CK-4, 15w-40 that's on sale at Sam's Club or Costco (3 gal. ~$30).


Well even if it is a bit more I like to be constant with the oil I put in my engines, and like it to be good quality.
This is part of the reason why, this is the tappet gallery on our 2001 Ram CTD at 300,000 miles.

[image]


Wow, that looks great! I only use top quality oil as well along with OEM filters in all of my vehicles.


I order my filters from Geno's Garage, yea they take a week to get here, but I order replacements when I use the ones I have, just in case I get some bad fuel.


You may have said but that looks like you ran Delongs 400 with all the black streaks.

I did my killer dowel pin at 100k on my 98 12V pulling front cover. My truck was Delongs for the first 50k when I bought it I switched to AMZ/OIL 15-40 Diesel Marine. Did the same on my Dad's 94 12V at 120k, he used the AMZ/OIL after first change. My engine was clean but had a lot of black streaks on the front and under the valve covers. My Dads was a golden spotless clean on both locations.

Does it matter??? Who knows.


2015 RAM LongHorn 3500 Dually CrewCab 4X4 CUMMINS/AISIN RearAir 385HP/865TQ 4:10's
37,800# GCVWR "Towing Beast"

"HeavyWeight" B&W RVK3600

2016 MobileSuites 39TKSB3 highly "Elited" In the stable

2007.5 Mobile Suites 36 SB3 29,000# Combined SOLD

BenK

SF BayArea

Senior Member

Joined: 04/18/2002

View Profile



Posted: 11/01/20 01:56pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks and know that chart but it is not the hot end that I’m most interested in.

Film strength is the biggest component specification am in interested in.

As I believe in the articles over many decades referencing that most of engine wear is due to dry starts. Mostly after extended times off, like over night or a few days.

Too many will just shut off their ICE after driving HARD. I allow mine to cool down before shutting down after driving hard. Around town, sure just shut it off, as my ICE doesn’t get up there in temp just driving around town.

Which reminds me...time to replace the severe duty fan clutch, as it doesn’t couple as high as it used to. Know because it doesn’t ROAR anymore.

Am after the highest film strength keeping as much of an oil film as possible and believe higher viscosity of the lower number helps solve that issue.


ShinerBock wrote:

BenK wrote:

IMHO...depends on how hard you plan to drive it...

I'd go higher viscosity


Both have the same viscosity grade of 40 at operating temp so they are about the same when driven hard with 15w40 having the slight edge. It is their cold temp viscosity grade that is different which mainly only comes into play when the oil temp is below 30F. One has a cold viscosity grade of 5W and the other 15W.

Snip....



-Ben Picture of my rig
1996 GMC SLT Suburban 3/4 ton K3500/7.4L/4:1/+150Kmiles orig owner...
1980 Chevy Silverado C10/long bed/"BUILT" 5.7L/3:73/1 ton helper springs/+329Kmiles, bought it from dad...
1998 Mazda B2500 (1/2 ton) pickup, 2nd owner...
Praise Dyno Brake equiped and all have "nose bleed" braking!
Previous trucks/offroaders: 40's Jeep restored in mid 60's / 69 DuneBuggy (approx +1K lb: VW pan/200hpCorvair: eng, cam, dual carb'w velocity stacks'n 18" runners, 4spd transaxle) made myself from ground up / 1970 Toyota FJ40 / 1973 K5 Blazer (2dr Tahoe, 1 ton axles front/rear, +255K miles when sold it)...
Sold the boat (looking for another): Trophy with twin 150's...
51 cylinders in household, what's yours?...

BurbMan

Islip, Long Island

Senior Member

Joined: 09/20/2001

View Profile



Good Sam RV Club Member


Posted: 11/01/20 02:20pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks for the responses and think I'll be fine with the 15W40. Going to order this kit from, Cummins online store.


2015 Ram 3500 SRW 4x4 Laramie Crew Cab Long Box, Cummins diesel
2002 Lance 811 Slide-In Camper
SOLD: 2008 Terry 34' TT
SOLD: 2001 K2500LT 8.1L Suburban

Lance 811 Renovation Story!
Project Complete!
Maiden Voyage!


Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 6  
Prev  |  Next

Open Roads Forum  >  Tow Vehicles

 > 5W40 or 15W40 in 6.7 CTD?
Search:   Advanced Search

Search only in Tow Vehicles


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:




© 2021 CWI, Inc. © 2021 Good Sam Enterprises, LLC. All Rights Reserved.