Yes, the leak was at the sensor. Getting it out and back in was tight, but
do-able. Both the spacer and sensor came out, so I separated them both,
cleaned it all and then reassembled the spacer and sensor and put it all
back in. It did take me 20 minutes to figure out why I couldn't get the wire
out of the way. The zip tie was the same oil-caked color as the sensor.

While tight, it was possible with a regular 24mm 1/2" socket and minor
manipulation of the heat shield. I did have to carefully bend the tab of the
sensor over in order to get enough room for the socket wrench to insert
partially into the socket. Otherwise the tab blocked the socket wrench
insertion. I put a new bright red zip-tie around the wire and sensor and all
is good.

I took it back to the car wash and it appears to be fixed. As jeff said, it
doesn't appear that the oil cooler is to blame at all, but I do have a nice
o-ring for when it does start leaking.

Thanks all for the help. I've decided  I need to get a little mirror so I
don't have to slide my iPhone in to take pictures.

On Wed, Jan 26, 2011 at 6:55 PM, Jeff Lincoln <magikvw@gmail.com> wrote:

> Everyone seems to be missing the fact that it looks like the leak is at the
> oil sensor (based on the linked pictures) the oil cooler is not the suspect
> anymore. (although those are all good tips for doing that o-ring
> replacement).
>
> I have never replaced that sensor before but I hear it can be a bear
> because
> of the tight quarters in there. I think (although I could be wrong) you
> might find something about this on ben's website:
> http://www.benplace.com/
>
>
>
> --
> Thanks,
>
> Jeff
> '85 GL (Gertie)
> '90 Carat (Grover - the noble parts donor)
> '86 (We call this one Scrap)
> '78 Bus (Melissa) Patty's Bus
>