could it be the oil pump ?
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2002 Saturn L100 Question: no oil pressure in top end of motor lifters are very noisey
yes have the oil pressure ck'd with a oil pressure gauge
Answer #2milesauto from Miles Auto Service Inc., July 02, 2012, 13:32Master
Test the engine oil pressure. It should be 50-80 PSI at 1000 RPM.
2. Check for a loose timing chain.
3. Check for a ruptured engine oil filter. The pieces can get sent through the oil passages