Somebody on another forum is trying to convince me that my engine might have oil starvation issues because I'm running 5W-30 in it, even though it says 5W-20 on the filler cap, since "the passages are smaller and the clearances are tighter". Specifically, it's a Honda K24Z1. I find that hard to believe, but I don't know if this was an engine that previously called for 5W-30.