Havoline 20W-50 Motor Oil
Product Review (submitted on December 1, 2012):
This was my summer oil choice I put in my '76 Suburban with a 468 CID engine (454 bored .030 over stock). Ran it like a scalded ape in the summer months and the 20W50 stood up to the insane punishment. I used the Havoline 5W40 synthetic in the winter months for easier starting and flow in the Indiana winters. No complaints.