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  1. S

    D-A Lubricant Company Classic Car Motor Oil

    Wondering if any has any experience with this CCMO stuff from D-A to put in a 50 year old car.
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    3.1 buick piston slapper oil recommendation

    Thanks for the hearty welcome to the forum everyone.I guess its bad pistons 1-4 update is teflon coated in the 3.1
  3. S

    3.1 buick piston slapper oil recommendation

    Hello all, Been using 10-30 M1 HM in the Buick with the typical cold start slapping problem. Idid replace the lower intake gasket and got the dexcool pudding out. I saw the TSB regarding a bad number of pistons in these cars(2000-2002?) I forgot whether it was born with 4 bad pistons(size?) out...
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