Seeing as how oil is fed into the top of the filter on a stock WBX, all
filters automatically have the "anti-drain back feature".  It's known
elsewhere as "gravity".

tabe johnson/87 westy

*** cut here ***

Date:    Wed, 27 Aug 2008 06:06:18 EDT
From:    Frank Condelli <RAlanen@AOL.COM>
Subject: Re: 719/5 vs 719/12

In a message dated 26/08/2008 7:37:24 P.M. Central Standard Time,
LISTSERV@GERRY.VANAGON.COM writes:

        The oil filters on both the  1.9 and 2.1 waterboxer engines are
exactly the same. ANY "GOOD" brand of  filter is acceptable as long as it has the
anti-drain back feature !