Re: Changed The Weight Of My Oil
15w40 diesel oil is pretty good stuff. It has plenty of additives for long engine life, and should be thick enough to allow your engine to run quietly... without being too thick for warm up. I consider it perfect for old flatheads.
If it is still not thick enough to keep the engine quiet, consider a conventional 20w50. Just be careful with warm up, and allow the engine to get some heat before running it very hard at all.
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Mike Jr. here. I get on here every few months to check messages, and look through his almost 500 saved messages for information on the '29 and '34 I still have. A lot of very nice people on here. He truly enjoyed Ford Barn.
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