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  1. 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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