Recently bought A4 2006 reg from a private dealer. The car has done 60k miles while the 18k service and 37k service was AUDI service, 60k service was done by that private dealer. He seem to have changed the cambelt and engine oil/filter. Any advice what else need to be checked/replaced for 60k service? The car came with original invoice for AUDI service, but no service history book. Can someone share the maintenance schedule for 60k service?