> AS I recall from way back - in addition to the filter material and it's
> construction - one of the big issues on oil filters for the Vanagons is
> that on most oil filters the anti-drainback valve in them is not
> adequate for the Wasserboxer engine - and that contributes to the fairly
> rapid drain-down of oil in the engines oil galleries  and quickly
> leading to the infamous Wasserboxer valve lifter/clatter syndrome -
> i.e., flat hydraulic lifter.
> 
> Crappy filters you don't want, for sure. But along with a filter of good
> construction and material - you also want a good anti-drainback valve.
> The Mahle/Mann filters at least have that.

You're right. Some years ago a list member actually emailed Mahle themselves
regarding the filter differences. Mahle replied that the Vanagon filter has
a better anti-drainback valve than the Golf filter, because that the Vanagon
engine is more prone to oil starvation at startup. They also stated that the
Vanagon-specific filter has a higher quality filter material than the Golf
filter. It's in the archives.

- Ron Salmon
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