My oil light does not come on when my 84 vanagon first
starts.  After a few minutes, it begins to flicker at
idle.  After driving the vehicle or extended idling,
the oil light stays on while the vehicle is idling.
20/50 oil and VW filter.  With only a VERY slight
increase in RPM the light drops out.  (I have not
tached it yet to see what the idle rpm is.)  Engine
has 150k and runs well (70+ on the interstate with a
quarter throttle or less.)

I plan on turning the idle up a bit, but am I merely
masking the problem?  Should I be thinking oil
pressure problems (bearings?) Or overheating???

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