Rotella T 15-40. I have this in because I used it at the dyno. Going to drain this weekend but might get the same stuff. Herd alot of good things about this oil and know alot of people that run it in their cars and have good results. What do you run?
I heard that the Zinc content in rotella is decreasing but I am not sure. That would be bad if you have a flat tappet engine. There are plenty of threads on the topic here so I don't mean to start a new discussion.