Edward Duntz wrote:
 > I just looked at an STP and a Fram that I have, and I see rubber
under > the holes on top as well.

Now I'm no oil filter expert but, so I've been told, some department
store filters don't have the anti-drainback valves and others, such as
Fram, have them but they don't work as well.

Years ago I used Fram filters and found that, for me anyway, I had a
much more frequent problem with lifters bleeding down than I've had with
Mann or Mahle filters.

Mike
'85 GL Westy 2.1
'84 GL 7 pass
'84 Westy
'84 Westy (parts)