Power to the List. Where two VW mechanics failed, Joel Walker succeeded.
Here is a copy of Joel's analysis and my reply:
~~~~~~~~~~~~~~ C O P Y ~~~~~~~~~~~~~~~~~~~~~
Joel, I think you have the answer to my question:

<<Question: what has low oil pressure got to do with a plugged exhaust?
We
were told by two reputable VW mechanics that this was not their first
experience of low oil pressure in conjunction with a plugged cat but
neither of them could explain the causal relationship. Can you?>>

Joel Walker wrote:

> you may be making the wrong assumption: what if the light and buzzer
> came on because of HIGH oil pressure?? there are TWO sensors. if the
> cat is plugged, then the exhaust is restricted, so the combustion
gases
> can't get out that way, so they'd likely blow past the rings (much
more
> than normal) ... pressurizing the crankcase more than usual. that's
the
> only thing i can think of. but it should have popped the dipstick off
> or blown oil out somewhere.   ??

Your prediction is correct: yes, we were blowing oil out past the
pressure
switch. Your description also explains why we found gasoline pollution
in
the oil.

Thanks again Joel,
Larry