Decreasing oil pressure as engine heats up.

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DUGWAY
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1992 VW Cabriolet, 8 valve, 1781cc, 120K miles, gas.
Cold engine oil pressure is about 4 bars, at idle.
Cold engine oil pressure is off scale above idle.
Warm engine oil pressure at idle is below 0.3 bar. Warning light comes on when below 0.3 bar.
Warm engine at 2000 rpm, oil pressure is about 2 bar

Replaced: oil pump, oil and filter, connecting rod bearings. No change in oil pressure. Still around 4 bar at idle when cold and drops to less than 0.3 bar at idle in about 5 minutes as engine heats up to normal.
Nov 10, 2007 at 9:59 AM
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RASMATAZ
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Check the oil pressure with an oil pressure gauge-might also be the oil pressure sending unit or wiring problem
Nov 10, 2007 at 10:13 AM