Some time ago, I asked Purolator about the differences in their
filters that would fit VW.  This is the reply in part:
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"Thank you for your inquiry on Purolator Filters.

............. The L20252 contains an anti-drainback valve. ........

Purolators' Automotive website is www.pureoil. com"
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Purolator is a highly rated filter and is sold by Pep Boys and also
under their brand name (same number).  I've used them on all my
VWs for years with no problems.

John

New address - jofo@innercite.com