Marty,

I have the identical van and solved the identical problem this year.

There are two sensors that control the oil warning light/buzzer.  The one
that needs to be replaced is the low rpm sensor.  I came to this conclusion
after I wrote the attached post.  My non-dealer VW mechanic simply replaced
the sensor for a nominal fee, and the problem disappeared.

My attached post explains the reasons why this problem occurs, and note
that it seems to be reasonably common.  Please undeerstand that you have
adequate oil pressure, but that buzzer is really annoying.

Another point.  ALWAYS USE AN ORIGINAL VW OIL FILTER.  DO NOT USE FRAM OR
SIMILAR.  The pressure relief valves are different and it can contribute to
the problem that you currently have.  Also, use 20-50w oil, unless it is
under 10-20 degrees F.

You may also find that the buzzer will come on after extended highway
driving when you drop to low rpm, as at an exit, or a traffic jam.  Don't
sweat it; all is okay and the buzzer will stop as soon as you increase rpms
slightly.

I hope this is helpful.  If you have any further questions, let me know and
I can refer you to some of the instructive replies I got (and saved) from
more technically oriented listees.

Budd Premack
87 Wolfsburg, 84 Vanagon,  86 Syncro (for sale)
73 Super, 64 Bug
Minneapolis, MN
Re Oil press. warning buzzer Budd's summary.eml [application/octet-stream]