Ok. I am confused. Please chime in. Based on reading the forum..I am using rotella t diesel 15w40 as it seems to be highly recommended. My friend was told it would void warranty by our dealership. The dealership recommended 20w50 valvoline premium. This seems to totally ignore the manual.

Question 1
Does using RotellaT diesel 15w40 void my warranty?

Question 2
The valvoline is not 15w40 and it does not have a rating per the manual. Seems like this one would void the warranty!

I would get the pennzoil if it was available but nobody has it. Not even the dealership. Seems like such a simple thing would not be so complicated.




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