I have had a similar problem.  I drive at freeway speeds on my way to work,
and no problems, as soon as I exit and put the clutch in and the RPM's drop,
the oil buzzer come on.  With the clutch in I rev the engine a couple of
time and that seems to bring the pressure back up and the buzzer goes away.
The strange thing is that this does not happen all of the time, probably
once a week.  It feels like the movie SPEED where the van will blow if I
drop below 55 MPH.  Now if I could only get Sandra Bullock in my carpool
group.

Any clues what causes this drop in pressure?

Leif Paulsen
'86 Syncro GL "4BY-THOR"

> 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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