The Stovebolt Site Forums The Shop Area General Truck Talk Oil: What's in your engine?

I run 20/50 in most of my stuff,mainly because they're all in the high-miler class,but also so I can buy one brand (Castrol) and weight of oil for all of 'em,but I'm breaking in my 355 with 10/40,then it'll have 20/50 too. 20/50 also seems to reduce the oil consumption on a couple of the "looser" engines.
Speed