hello all. been reading and lurking here for some time, trying to make some sort of sense of all this. who knew how murky the world of oil really was! reason for posting in the euro forum is as follows. i'm finishing a rebuild on a 1995 volvo 850 turbo engine. i've taken pains to make it a solid base from which to run 20+ psi of boost. my plan was to break-in on castrol gtx 5w-30 and then go with syntec 5w-40 as it has all those nice vw, mb, and porsche approvals. sound like a solid plan? thoughts, alternatives? haven't seen many volvos on this board. anyway, hello!