I had the same problem when I picked up = my van from the auction.

Distraught, I took it around to the = local VW mechanic, who smiled and said "Ah, lifter noise." He produced a small = botle of stuff, can't remember the name of it, but it claims to reduce built up = desposits and quiet noisy lifters. We poured it into the engine and five minutes = later the noise was gone.