Hey guys (and gals), I'm almost at the 10,000 mile mark on my Ej257 hybrid. I know from around that point onward, I can use synthetic oil. Conveniently, there's an amsoil dealer very close to me, and I've heard really good things about their oil from people who treat their vehicles well and are close friends with me. But, I figure I'll ask anyway- Does anyone have any better suggestions, issues they have with amsoil, or a suggestion for which amsoil product to use specifically? For instance, I've heard talk about some oils being too thin for some of the Ej motors when you use the recommended weight. Would that be something I should factor in for amsoil? And come to think of it, I noticed EFI put a little oil in when they tuned it, and they used 10W30, though the manual (and the builder of the engine) said 5w20, and I don't quite know what to think of that. I'm intending on calling EFI to inquire about that one, but first I have to not be at work throughout their hours.