Some might disagree with me, but my opinion is that I would sooner pour straight tap water into my crankcase than anything made by Castrol. Call me crazy, but that's just what I think. I had a brief (read 3 miles) experience with Castrol in a freshly rebuilt engine and I swore to never use another one of their products again. Near zero oil pressure didn't make me feel warm and fuzzy with near 3 grand dumped into an engine.