I bought a very detailed Service manual ( its got 2000 pgs. If anyone is interested, list your e-mail then i'll send it to ya.I have it in pdf file. It is for all engine models and chassis models, including jettas, golfs, 2.0, 1.8t, 1.9 TDI, etc) and listed under routine maintenance is the replacemement of the spark plugs at 60k intervals. Im at 57k right know, so its almost time.
Is there a way I can "upgrade" my plugs? get more performance out of them? what are some good brands?