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My thoughts too. When you shut the motor off there is oil in various other places - the timing cover, in the valve covers, clinging viscously to all the surfaces. It takes a little time for it to all trickle back down to the oilpan to get a realistic reading.
Interesting thing I learned about my '95 VW (VR6 motor) when the oil pressure idiot light sender started leaking and I had to replace it. Two things:
1) Those sensors are in a very inaccessible area on the front side of the engine and I had to take the ENTIRE front end off the car to get to it - grille, headlights, bumper, rad support, radiators and fans (although I was able to leave the hoses attached on A/C and coolant). GOOD GRIEF - it shouldn't take 5 hours of labor to replace a $3 sensor!!!!!!!!!!!!!!
2) It has 2 idiot light senders. One is active below 2000 rpm, and is the typical <5psi switch that only goes off when there is just about NO oil pressure at all. It has another one that is active above 2500 rpm, that will light up the light (and a warning chime!) if the oil pressure drops below about 25 psi when revved up. Smart!
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I'm JohnMc, and I approved this message.
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