Choice of oil

[donv]

15-50 for warm weather only use in New England. I was uncomfortable with trusting the additives to fully protect the engine at high temp and it was silly to run the risk when I seldom drive the car at low temp (so I don't need the 0w- part). I had read an article claiming that the only way they get a wide spread on the cold/hot viscosity is through the additives, which are subject to breaking down. Once they do, you're drifting to the lower end of the rating for the "resulting" protection when hot.