I have tons of experience with Volkswagens. Had 13 of them up to this point, and the hard lesson I had to learn is.... Only buy the inexpensive Bosch tune up parts! At one point I had some high dollar racing spark plugs in my race car (mini stocks at Monroe) and it just quit running right out of the blue. Put an old set of Bosch plugs in and away we went. Same story with my brothers car,,, Just quit running one day went over switched all the autolite parts out for Bosch and away he went. Its weird, but the inexpensive Bosch stuff works best!