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Replace the oil pump and you may even need to replace all the engine bearings too. You loose alot of oil pressure through the engine bearings if they are worn out. 10W30 Oil may raise the pressure alittle.
CR9640 >>SLICK 50> IT worked in less than a week, returned oil pressure for me on my 91 SUB w/350 TBI with 175k miles on it. OIL PRESSURE went from almost 5 lbs up to over 55 lbs (consistent) and still maintains plus 50lbs pressure at moving speeds. Idle drops to just above 30lbs after warm up. Engine is now at 195K miles and no adverse effects. No leakage, no smoke, no obvious problems. Only cost was less than $15.00 at Walmart. It is worth the investment to try it before expensive labor.
CR9640 >> UPDATE > 204 k miles, had to add 1 bottle Slick50, Oil pressure had dropped, now back up over 50 lbs 95% of time. Worth the cost versus repairs that I can not afford.
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HUH???????????????????????????
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