2024 6.7 Cummins factory fill UOA

[johnmyster]

Because they assume that as a whole the 15W-40 oils will be of inferior quality to those that are 5W-40 at least in terms of base stocks. It’s an easy way for them to communicate this to their customers.

I don't disagree but strangely 10w-30 is allowed which is available as a conventional. Rotella T4 and Delvac 1300, both meet CES 20086. Our 6.7 is solid lifter, so no dog in the fight.

It seems like a better way would be to make it a part of Cummins CES 2008x, rather than all the confusion/stigma about cold flow in the bro diesel truck communities.

Our Mazda, likewise, was spec'd 0w-20 due to the OEM's desire for full synthetic, so the concept is not new.

 

[kschachn]

I don't disagree but strangely 10w-30 is allowed which is available as a conventional. Rotella T4 and Delvac 1300, both meet CES 20086. Our 6.7 is solid lifter, so no dog in the fight.

It seems like a better way would be to make it a part of Cummins CES 2008x, rather than all the confusion/stigma about cold flow in the bro diesel truck communities.

Our Mazda, likewise, was spec'd 0w-20 due to the OEM's desire for full synthetic, so the concept is not new.

Yes, always confusion about what the winter rating means, and equally important what it does not mean.

Sometimes these bulletins or communications from automakers are dumbed down so much they generate confusion instead of clarification.