Seriously ,unless your a serious racer running high performance race after race than OIL is OIL .
I've used Sunoco ,Exxon ,Torco,Klotz and never noticed a difference in performance and my engines look clean when torn down.
I try to spend the least amount of money on oil .it's all made by the same companies anyway.As long as it's TCW-3 certified it's all the same
Do some research and find the differences .:wink: