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#84698
David Stanton
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    quote green thumbs:

    Motors change and Oil changes. I had a 1968 Plymouth and used high grade Shell X 100
    I bought a 1974 Nova replacement. On 1st oil change I asked for Shell X 100. At 2nd oil change
    the oil came out like pudding. NOT good! Owner’s manual (who ever reads those?) called for a
    much improved oil…those letters on top of oil can do mean something
    Louis

    Yeah oil has changed over the years! I’ve got a couple old cars (1951 and 1968) and now, if you have a push-rod engine, you are supposed to either seek out oil that has Zinc additive ZDDP in it, or buy the zinc supplement and add it to the oil or the cam lobes and/or valve lifters will wear out. ZDDP used to be in nearly all motor oils. Antifreeze for older cars is another issue, but enough digression from the original subject in this string.

    On my 4-stroke mower, snowblower, and other small 4-stroke engines, I switch to synthetic Mobil 1 at the 2nd or 3rd oil change. I’ve heard that some engines may not break in properly with synthetic oil.
    Dave