This is just speculation and it goes back to the subject of windage
trays.
Possibly your crankcase is slightly overfilled and the crank/rod assembly
is slinging additional oil as the level gets closer to the moving parts
because of the slighyt incline change.(oil fan thoery).
This could be causing foaming of the oil and just your temporary low
pressure reading.
(This is a serious reply fellows, so don't spray that coffee all over
your keyboard).

Stan Wilder
Air Cooled Westfalia

On Sun, 26 May 2002 08:05:06 -0700 Joel Cort <joel_cort@YAHOO.COM>
writes:
> Kevin,
>
> The first culprit I would look at is the Oil Filter!
>
> If you are using anything but a MANN or genuine VW filter the
> relief
> pressure valve is not appropriately set for out Vanagons.
> The FRAM and BOSCH brands are NOT adequate oil filter.
>
> Go to one of the list vendors and purchase a set of oil filters
> specifically for our Vans.
>
> If you still have buzzer problem you may have other issues with bad
> low pressure senders.  How many miles are on this engine? You
> possibly could have an aging oil pump or weak engine bearings.
>
> Any other Mechanics on the list want to jump in???
>
> Good luck with the $5 fix of a new oil filter.
>
> Joel
> 89 Syncro Westy MV
> Rochester NY.
> --- kevin obrien <kevindobrien@YAHOO.COM> wrote:
> > Hello All:
> > I have  a 1990 Carat...
> > My oil warning light/buzzer occasionally goes on
> > briefly after climbing a long hill.  It seems
> > sporadic...and the engine is showing no signs of
> > overheating. Anyone familiar with this glitch???
> >
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