Give me the low-down on the oil...

Discussion in 'General Motoring' started by James1549, Sep 5, 2006.

  1. James1549

    James1549 Guest

    I have ' 92 SL2 since new with 120K on it now. It does use some oil but
    nothing yet to be concerned about between 4K oil changes. Currently am
    using 10w30 as I always have. I have access to good quality bulk oil
    in two grades, either 10w40 or 15w40.

    It seems in past postings I have read, NOT to use 10w40 in newer modern
    engines. I don't have a problem with the 15w40, but could someone
    explain the reasoning for the 10w40 issues, if any at all. Everyone's
    opinion are appreciated.

    Thanks, James
    James1549, Sep 5, 2006
  2. James1549

    SnoMan Guest

    THe reason that 10w40 is not approved in modern engine is because a
    large amount of VI (Viscocity Improver) is need in conventail oil to
    give it that range. VI tends to cook out of oil in piston ring area
    with time and cause them to stick if not changed frequently. 15w40
    does not have this problem. GM had boatloads of stuck ring problems in
    80's that lead them to no longer approve 10w40.
    SnoMan, Sep 5, 2006
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