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I think the Williams BMW broke the 19K barrier last year. It is interesting to read on the F1 tech sites what the barriers are to further increases. They are beginning to have problems above 19K with getting the fuel to combust fast enough.

Thanks guys. The miata engine features HLA type valves and it'll tick like crazy if I go lower than 20W50...which is a bummer, beacuse people have shown that lighter weights do help. But the valves get beat up...not a trade I'm willing to make. Any thoughts on oil filter? Thanks Eric

Hey all, this is a GREAT forum. Proof that the internet is good for something other than celebrity news and porn (which can be the same things...) Anyway, I need some advice to optimize my racing efforts...perhaps you all can help me. I race a 1990 Mazda Miata in what is called SpecMiata. It...