Just FYI...  I have been using an Audi filter listed for (among other
Audi's) the '86 Audi 5000 2.22L turbo.  It is the same filter VW lists for
the Vanagon but it has an internal back flow valve that holds more oil in
the filter after the van is shut off (this is my possibly simplistic
understanding).  It seems to reduce the occasional cold start tapping,
particularly when starting and running the van during winter storage.
Often the filter also has a trick "nut" on the end for easier install and
removal without a filter wrench.

Eric
Portland, Maine
'86GL 180K miles