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  1. PeterD

    MEP 003A Oil..

    One would get slightly better performance (faster cold starts, etc.) with a synthetic 15W-40 but that will cost more per-fill. My MEP-004 uses eight quarts, and I use regular stuff in mine (Rotella). Which is fine, since that's what I run in my Hummers as well...
  2. PeterD

    MEP 003A Oil..

    Personally I'd consider 15W-40 Rotella for virtually any diesel engine. I doubt that 10W-30 would be a problem either...
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