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Some reasons for low oil pressure is sludge build up, bad oil, clogged filter (Despite by-pass valve), bad oil pump.

A major reason is the main bearing are going bad. That means rebuild.

A possible temporary remedy, besides changing oil and filter is to replace oil pump with a heavier duty one.

The oil pan needs to be dropped to access most oil pumps. That can be easy on some older vehicles but can be very difficult on others.

Another possible solution, but risky, is to flush the engine oil. Only do this at a professional shop that specializes in this along with their other services.

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Q: How can you fix a low oil pressure problem without a rebuild?
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