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im sorry there is no pressure off.
running pressure is low because.
1: wrong oil, or AF in oil, or brake fluid from jiffyboobs. or water.
2: fuel in oil , bad bad bad.
3: dumping additives it it. bad.
4: BEARINGS IN ENGINE SHOT. (warn bad)
5: THE GAUGE FIB'S.
I NEVER NEVER NEVER trust car gauges, i use MINE>(in hand)
i also test my hand gauges, (ask)
The sending unit was my guess...Could be the oil pump going bad...Or even a to good brand oil filter restraining the oil from recirculating...I've seen it happen..
first thing check is the engine oil level.if oil level okay check oil pressure should be for the 4.2 engine oil pressure should be 12 psi @ 1200 rpm for the 5.3 oil pressure should be 18 psi @ 2000 rpm if oil pressure good problem in the oil pressure sending unit. if oil pressure is low problem faulty oil pump or worn crankshaft bearings if oil pressure low engine will have rod knock.make sure you are using correct oil viscosity if oil too thick you will have low oil pressure oil too thin you will loose oil pressure.
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