Great reference source for Mobile 1 oils
It looks like the 0w 40 is the best bang for the buck High Phosphorus*
Level and
Zinc*Level and available at Walmart for $24 for 5 qt bottle. The 0w 50 racing oi is probably best for track and is $16 qt.Since I don't track the car and barley push it to the extreme I'm going with the 0w 40.
http://www.mobiloil.com/USA-English/...duct_Guide.pdf