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Traumatized by a head gasket before? I think you'll know if one fails waaay before you see evidence of it in an oil filter.
Speaking of clean oil, where does all this "dirt" come from? The crankcase is pretty much sealed from the elements unless you habitually drive around with no oil fill cap and no air filter. Blowby was a big issue on old carb'd stuff where the chokes often malfunctioned and ran too rich, flooding and washing lube off the mushy soft, out of round, loosey goosey cylinders of the day. Not so much anymore.
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