> any kind of filter before casually slapping it up there.  Also, never
> overtighten an oil filter.  It can cause the gasket to pull away from the
> filter housing and begin to bind up on itself, creating ripples, and
> warping the can.  Leak city!  Could this have the culprit in your case?

a trick i learned as a wee lad:  when putting on any new oil filter, take
some new fresh oil and smear it on the filter's rubber gasket all around.
that'll keep it from bunching up as you tighten the filter onto the engine.
:)

it also helps to fill up the filter BEFORE you put it onto the bus. this
supplies the engine with oil for those few seconds during cranking, as
opposed to no oil being there for the engine to suck out of the filter. only
trouble is ... on the aircooled buses, this works fine; the  filter is
straight up and down. but on the watercooled buses, the filter is tilted, so
you can't fill up the filter all the way to the top ... stop about 3/4 way
up inside the filter. otherwise, the oil will spill out as you twirl the
filter onto the engine.

joel