Let's suppose that you only wanted to keep a single oil on hand for all your cars, trucks, equipment, etc; what would you buy? I would lean towards Amsoil's HD 15w40. I like the protection offered by a 40w and I don't live in a cold enough environment to be concerned about a lot of cold flow performance. HD 15w40 is Amsoil's best diesel oil. It can handle a lot of pressure, is shear stable, and has a stupid high TBN. I'm tempted to try it in some of the gas engines around the house to see how it performs. Thoughts or opinions?
Link to Amsoil HD 15w40
Link to Amsoil HD 15w40