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 > 5W40 or 15W40 in 6.7 CTD?

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blofgren

Surrey, B.C.

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Posted: 10/31/20 09:24am Link  |  Quote  |  Print  |  Notify Moderator

I used to run 15W40, but for the last couple of years I've been buying complete service kits from Cummins online which includes premium Fleetguard filters (fuel and oil) and Valvoline Premium Blue Extreme full synthetic 5W40. The engine does seem to be a bit quieter with the Valvoline, but I think either is fine.

Here is the kit that I buy.


2013 Ram 3500 Megacab DRW Laramie 4x4, 6.7L Cummins, G56, 3.73, Maximum Steel, black lthr, RAM 20k sliding hitch, Retrax, Linex, and a bunch of options incl. cargo camera
2008 Corsair Excella Platinum 34.5 CKTS fifth wheel with winter package & disc brakes

Walaby

Georgia

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Posted: 10/31/20 09:27am Link  |  Quote  |  Print  |  Notify Moderator

BurbMan wrote:


use 15W40 oil in the 6.7 Cummins diesel, unless the temp is going to routinely be below 0*, in which case you should use 5W40.

Here on Long Island, the temp rarely if ever even gets to 0*,

Think you answered your own question.

Since you asked, I use 15W40.

Mike


Im Mike Willoughby, and I approve this message.
2017 Ram 3500 CTD (aka FRAM)
2019 GrandDesign Reflection 367BHS


IdaD

Idaho

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Posted: 10/31/20 09:45am Link  |  Quote  |  Print  |  Notify Moderator

I run 5w40 synthetic but I think 15w40 is fine in most climates. I just tend to run into cold weather in the winter months so I like the colder weather protection. Rotella T6 is what I generally use. FWIW my father lives in a similar climate and has run conventional 15w40 for years in his 7.3 with no issues so either is probably fine for most applications.


2015 Cummins Ram 4wd CC/SB


noteven

Turtle Island

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Posted: 10/31/20 10:02am Link  |  Quote  |  Print  |  Notify Moderator

15-40 sounds ok in your climate conditions.

It is trouble where it gets cold. Have a search for videos where engine oil is cold soaked then poured (or not). Imagine the top end of your engine waiting for oil after a cold start.

Grit dog

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Posted: 10/31/20 10:55am Link  |  Quote  |  Print  |  Notify Moderator

It 100% doesn’t matter, although the 5-40 will be easier on extreme cold starts.
But I’ve lit off plenty of cold soaked Diesel engines, not plugged in, at -20 to -30 F with good old Dino 15-40. In those situations 5-40 is better though and plugged in even better.
If I was doing a winter oil change where it gets cold like where you live I’d go 5-40 just because.


"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.

rhagfo

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Posted: 10/31/20 11:57am Link  |  Quote  |  Print  |  Notify Moderator

I ran Delo 15-40 in the 2001, changed at 10K miles, had it tested and all was fine. Now with the 2016 switched to Valvoline 15-40 dino change at 6 months and about 6K miles due to warranty. Would love to go back to once a year 10K or so.


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

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otrfun

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Posted: 10/31/20 04:25pm Link  |  Quote  |  Print  |  Notify Moderator

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).

rhagfo

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Posted: 10/31/20 04:51pm Link  |  Quote  |  Print  |  Notify Moderator

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]

otrfun

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Posted: 10/31/20 06:28pm Link  |  Quote  |  Print  |  Notify Moderator

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.
Granted, 5w-40, being synthetic, probably provides better protection under extreme conditions (i.e. operation at or below 0 deg). However, we've come to the conclusion it's not enough added protection under normal conditions (our M.O) to justify spending almost twice as much money for it every 6 mo.

Bottom line, we follow Ram's recommendation to use API CJ-4/CK-4, 15w-40 when temps are above 0 degrees (or 5w-40 synthetic when temps are 0 and below).

* This post was edited 10/31/20 07:19pm by otrfun *

blofgren

Surrey, B.C.

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Posted: 10/31/20 07:36pm Link  |  Quote  |  Print  |  Notify Moderator

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.

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