Sorry to go off topic but anybody know if the Python 502 is roller or flat tappet?
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I typically go with the 15w-40 SM, from Shell Rotella or Mobil Delvac. Meets the oil specs from PCM. From reading the forums over the years, quite a few people run either of these two.
They also have a CJ rating (diesel), and are typically found in the truck area. As far as the diesel Ash comment, I have yet to find 15w40 without a API C* rating, and I doubt PCM would recommend an oil if they didn't think was good for our boat.
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