Most oils that come in 15W40 are the diesel oils. I'm not sure what the latest designation is, but I think it is C-J4 or something like that.

All oils have a C rating, but it's not good enough unless it is an advanced rating like CJ or CK might be out now. A little googling should come up with the answer. If you get one of the oils I listed in my earlier post it will meet the recent spec.

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2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

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