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  1. AndrewChrist

    Oil for severe abuse

    I've been lurking around this forum for many years and I finally have an oil issue I can’t seem to find an answer to. I am adding a turbo to my 2006 MX5 and I don’t plan on being gentle with it. So my issue is the OM asks for 5w20, my turbo builder is saying he uses BMW Castrol 5w30 that you...
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