I have a Big Block Ford that runs on Methanol. I have had bad luck with a lot of different oils......they break down quickly. After watching ESPN2 a few months back I seen Chris Demke (TAD) running a product called CleanBoost Performance Oil. I called this group and bought some of their 15w40 for my drag car.......since then, no engine failures and I can run 10 to 15 times down the 1/4 mile without draining the oil. This stuff really works.
Check them out at
www.cleanboostoil.com