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  1. M

    Heavy oil or thin?

    Chris 142: no "K"code just a factory "A" code. Runs great, 5-10 psi at hot idle. I was just wondering if I should go to a heavier oil and I have been using GM's engine oil supplement off and on. Thanks for all the great responses. Mark
  2. M

    Heavy oil or thin?

    Hello: New member here (long time lurker) and I have a question. I have a 1966 289 4bbl Mustang auto. I store it in the winter and drive it in the summer. I put about 5000 miles during the summer and the car runs like a dream. The compression is not bad (120ish), the bearings might not be as...
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