Posted by CenTex Farmall on January 15, 2011 at 20:35:12 from (32.176.153.250):
In Reply to: engine oil posted by Mike from Wisconsin on January 14, 2011 at 16:52:55:
The detergent oil does not "break up" or loosen old crud the way Tide does in a washing machine. If that were true then any engine run on detergent oil would never develop any sludge and we know that's not true.
What happens is that someone parks an old tractor, truck, car or whatever that is already crudded up and the things sits. Water vapor and acids in the crankcase along with umpteen freeze/thaw hot/cold cylces emulsify the crud and some of just plain dries out.
Next some enthusiast such as one of us re-discovers the lost treasure and the first time it's fired after sitting for 20 years the sudden heating vibration and liquid oil splashing around starts breaking stuff loose like crazy.
Best things as others have said, and I do this on my new finds, is to drop the pan and pull the valve cover. Clean. New oil and filter (nothing fancy the first time or two if it's really unknown) and then go to town, knowing what you have on the inside.
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