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  1. M

    Average Engine Life

    The underlying theme of most of the discussion this forum seems to be how to keep an engine going as long as possible. This brings up a question. What is the average lifespan (in miless) of a gasoline powered passenger vehicle (I'll leave diesels out of it for now, because that number would get...
  2. M

    Wide Range Multigrade Synthetics and VII

    With the wide range synths that are currently out, there seems to be an assumption that all of them (5w40, 5w50, 0w30+) use VII. We all seem to want to avoid VII as much as possible. However, I know (at least I've read) that as far back as the early 90's, M1 5w30 had no VII. As technology...
  3. M

    Is Pennzoil Purebase Group II or III?

    I did a search and didn't find any thing I seem to remember reading somewhere that Purebase was at least hydrocracked, if not hydroisomerized. Does anyone know which, if either? Or is Pennzoil just basic dead dino?
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