Quote:
Originally Posted by 455Grandville
That sludge will likely pass through a narrow passage and clog it or the oil pump making things worse. Engine machinist love anything that flushes the system as it gives them more business.
If you have low oil pressure drop the pan, take it to a machine shop and have them put it in the parts washer and throw in some new bearings.
Mechanic in a can wont fix excessive bearing clearances.
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^ This. Fluctuating oil pressure is a sign of that something is amiss in the bottom end; it could be the oil pump itself or the relief valve. In either case, no “snake oil” is going to correct it. I’m assuming you have put a mechanical oil pressure gauge on the engine to confirm the oil pressure, yes? If so, where did you “tap” the oil pressure at? The oil filter adapter or on the rear of the block? If you go through pulling the pan to have it cleaned, see if you can find an old solid copper penny. Rub the penny on the crank journals. If they collect copper the crank will need to be ground and polished.