D2 Oil Filter Questions

4A0332 cross references to 1R0729.
There should be a gasket 5B5937 on the top of the case 5B5939 in the groove in the cover and there should be a gasket 5B5940 on the bottom of the case in a groove in the base 6B0685. Normally you wouldn't remove the case to change the oil filter so it usually remains undisturbed.
As for the leak at the cover retaining screw, most likely the copper washer has hardened and is no longer able to mold itself to the shape of the sealing surfaces. If you know how to anneal copper then you can repair it or replace it with a new washer. I would stick with the copper washer as the top of the cover is most likely machined to suit the washer and not the seal.

When you reassembled the filter did you make sure everything went to together correctly and did not foul up on assembly? Also you need to put a fair amount of tension on the tee handle to get a good seal. I usually rotate the cover back and forth as I am tightening the handle to help guide everything in.

Regards

Phil

Phil - thanks for confirming part numbers and clarifying the location of the bottom gasket. I didn't remove the case, so the bottom one should be ok. My problem seems to be caused by the components not fitting properly when I reassembled the filters and cover because it wasn't just a leak, but more like a flow. The top gasket was in good shape with part numbers clearly readable, so probably been changed fairly recently by the previous owner. Leak at the copper washer was fairly small. I'll order a new one and make sure everything fits together properly and tighten down appropriately. Appreciate your help.