ive been running rottela 15w-40 in the late spring threw the late fall.And run rottela 5w-40 syn from the late fall to late spring.I will be looking into staying with a syn oil threw out the year.Starting this year.iam thinking about royal purple or Lucas oil.
But rottela 15w-40 and 5w-40 syn has been good to me for almost 5 years and over 100,000 miles