Can someone tell me which is the correct oil filter to use in my 1990
Vanagon GL?  It seems that every time I go to my FLAPS they insist on
selling me a Mahle OC 108, but when I have my van serviced, they use a Mahle
OC 47.  I've read that the filter should have a pressure release valve but
it's not clear to me which one has it.

Thanks for any help.

Bob Trousdale
1990 Westfalia