I've always ran mobil 10w-40 non synthetic. I run zdp additive ...risline I think its called, yellow bottle.
Anways i'm thinking of putting in synthetic since I run the engine hard. I see mobil 1 15w-50 has good numbers based on this chart: http://www.mobiloil.com/USA-English/...duct_Guide.pdf
What is everyone running with old flat tappet cams?