Warning - heavy anecdotal content to follow:

This has nothing to do with my VW or slick, but I tried a similar oil
enhancement product (can't remember which - but it had this cool little
plexi-box gear demo on the counter of local auto-parts store -- ok, call me
a sucker!  :-) on my 93 pathfinder, as it was getting up there in miles and
I was starting to get a second or two of tick after starting (when the oil
pressure was low).

Anyway.... After one treatment, it got noticibly worse, not better!  I have
subsequently had the engine flushed with a oil cleaner and have been running
oil-only ever since.  Unfortunately, the problem is still there, but has not
got any worse.  Coincident?

On a similar note, my Westy has just developed a constant tick!  Guess its
off to the archives...... My reference manual just cursorly covers lash
adjustment.

Brian