I had an oil leak from my 92 9000 T. It appeared to be combing from
around the filter mount. I bought a new o-ring for the oil filter mount
from Mile Hi in Denver.

Replacing it was much easier than I anticipated, although having a lift
would have been nice. I used a 1 1/16 socket (I did not have the 27 mm
but the 1 1/16 inch is 26.99 mm) and it came out and went back in pretty
easily. I did this after draining oil and before refilling.

It seems not to leak any more.

Charles