sae 15-40 only in Cummins?

[Killer223]

You are welcome to run what ever oil in your truck you wish.
I've learned that engine doesn't care. Get what ever is on sale, I have seen several truck on the road with 10/30 and zero issues. it still meets the spec, The OE recommendation is more for fuel econ that anything else, same with GM's suggestions. Yhese same engines are used over seas with much different regulations. The oils that are spec'd 20086 will be just fine.
Cummins calls for any oil that meets the spec. simple as that.

 

[Jim W]

What is fascinating, is that Cummins is recommending 10w30 in all their heavy diesels. I know of several folks with well over 500,000 miles and using 10w30 exclusively. Moving up to 80,000 lb of truck and cargo across the U.S. and Canada, year round on 10w30 without a issue. I am surprised that Cummins hasn't pushed 10w30 on the 6.7 lineup.

It is not Cummins who specifies the engine oil requirements for the 6.7L Cummins diesel in the Dodge/Ram trucks. It is FCA, that is responsible and they are the ones who will specify the engine oil requirements for this engine in their trucks! Why? FCA (Dodge/Ram) provides the engine warranty for our engines in these trucks. This is all spelled on in the purchase order and contractual agreement between Cummins and FCA. That is why when you change the engine oil and filter for the first time you will find a Mopar oil filter on the engine. You will also find a Mopar air filter in the air box too.

I am just saying.

I know when I worked at Caterpillar and any component that was sold to an OEM builder of another piece of equipment that builder was responsible for the warranty. A lot depended on the marketing agreement between the OEM manufacture and Caterpillar on who was responsible for the warranty.

 

[JR]

I've yet to see Cummins recommend 10w30 in the 6.7. Just because an oil meets the CES standard does not mean you are free to run any viscosity you wish. Can you in the short term? Probably, but until Cummins recommends it I don't see any reason why you would want to risk a $10,000 dollar engine. There's no tangible benefits that I can see that would warrant the risk to run a thinner than recommended viscosity.

For example, here is a recent bulletin from Cummins.
http://www.cumminshub.com/6.7-cummins-maintenance-schedule.html

Nowhere does it state 10w30 is acceptable.

 

[Tuesdak]

You are welcome to run what ever oil in your truck you wish.
I've learned that engine doesn't care. Get what ever is on sale, I have seen several truck on the road with 10/30 and zero issues. it still meets the spec, The OE recommendation is more for fuel econ that anything else, same with GM's suggestions. Yhese same engines are used over seas with much different regulations. The oils that are spec'd 20086 will be just fine.
Cummins calls for any oil that meets the spec. simple as that.

I used to do this till the "on sale" Royal Purple spiked the copper so high on the UOA it wasn't funny. Your engine gets used to an additive package so it's best to stock up when the oil of your choice goes on sale. Oils may be "all good" on their own, but, mixing them up all the time sure messes with UOA results. YMMV if it makes 10 miles of extra engine life or not.

 

[Copperhead]

I know when I worked at Caterpillar and any component that was sold to an OEM builder of another piece of equipment that builder was responsible for the warranty. A lot depended on the marketing agreement between the OEM manufacture and Caterpillar on who was responsible for the warranty.

When I have bought KW, International, and Freightliner, class 8 trucks, whatever engine was in it was NOT covered by the truck OEM but the engine OEM. Same for trans and diffs. And they supersede any ideas the truck OEM thinks about it. And that is the same policy today as it has been for the 4 decades I have been in commercial trucking. It has been my bacon on the line as I am the one paying the bills, so I am very aware how it works.

And I would tend to take the final word from Cummins, who designed the motor, than a batch of corporate goons from Italy.

 

[moparguy]

No, I'm not stirring the pot.....But now let us discuss who builds the best transmission and then perhaps air filters! :-laf:-laf:-laf

 

[Killer223]

No, I'm not stirring the pot.....But now let us discuss who builds the best transmission and then perhaps air filters! :-laf:-laf:-laf

Jasper and Fram?

 

[moparguy]

Jasper and Fram?

NO NO NO.....ATS and a oiled K & N!

 

[Killer223]

NO NO NO.....ATS and a oiled K & N!

got me on the K&N, i'd say flip a coin on the ATS vs Jasper though.

 

[Tuesdak]

NO NO NO.....ATS and a oiled K & N!

Warn a forum member before posting something that funny! That was a real wipe my drink off the monitor from laughing it out my nose moment. :-laf

 

[fest3er]

My '98 service manual states that 15W40 is good for all temps down to 10°F, 10W30 is good for 30°F down to 0°F (or down to -10°F with block heater), and synthetic 5W30 is good for 0°F down to -10°F without block heater. (Yes, it seems odd in some ways, but that's what the SM says.) I suspect newer engines have similar recommendations. I don't recall ever hearing about any engine lubes that are incompatible with 'common' engine lubes.

 

[JR]

From my 2014 owners manual.

 

[jhenderson]

When I have bought KW, International, and Freightliner, class 8 trucks, whatever engine was in it was NOT covered by the truck OEM but the engine OEM. Same for trans and diffs. And they supersede any ideas the truck OEM thinks about it. And that is the same policy today as it has been for the 4 decades I have been in commercial trucking. It has been my bacon on the line as I am the one paying the bills, so I am very aware how it works.

And I would tend to take the final word from Cummins, who designed the motor, than a batch of corporate goons from Italy.

It makes no difference what your class 8 warranty says. This engine is purchased from Cummins by FCA sans warranty to lower the cost. If you had a problem and took it to a local Cummins shop for repair you'd pay out of pocket. FCA has the final say and all warranty work will be done by a Ram dealer.

 

[SyN]

Old thread I know: I’m going to be running Schaeffers 9000 5W-40 year round.
No worries while towing the family 5th wheel during the summer months. (Plan is 1 yr OCIs).
This oil is extremely robust and loaded with ZDDP.

 

[ofelas]

I believe Gary (GAmes) has been running 10w30 for around a total of a million miles on his 12v.

 

[Cummins12V98]

Personally I would not run 5-40 since AMZ/OIL's 15-40's pour point is nearly as low as their 5-40.

 

[ofelas]

What year is the truck with the intended oil change?

 

[AH64ID]

Older thread... but I'll play.

Cummins, not Ram/FCA/Dodge, has allowed a 10w-30 in the ISB for at least a decade. I can't tell you about earlier as I've only had my truck 11 years and it's been allowed the whole time. The kicker is that it must have a High-Temp/High-Sheer of 3.5 cSt if it's CI-4 or newer, unless it's only used in the winter... so it's much easier for OEM's to just allow 15w-40 and 5w-40 than to say 5w-30 is okay with certain parameters which generally aren't published on the bottle.

Remember 10w-30 was around as winter oil before 5w-40 was.

This is from the ISB service and maintenance manual found on quickserve.

 

[ofelas]

I usually run Amsoil HDD 5w30 after initial oil analysis came back as excellent; doesn't do as well as AME 15w40 in some engines though.

Finally decided to try some CK4 oil last month, been running the 0w40 DZF for the past several weeks.

 

[Cummins12V98]

I am more than happy with my FULL 15k oil reports. AMZ/OIL 15-40 FULL Synthetic.