Hi folks... I recently purchased an 88 560 with 75,000 miles on it from a dealer. The dealer did all the standard maintenance on the car and in addition fixed some other issues (new brake pads and rotors, new electrial switch for driver's side window, new motor mounts, various new belts, and a few other items). However, they did not replace the plastic guides for the timing chain. My own mechanic recommended that I should just go ahead and replace the guides, belts, etc any way..and at the same time since certain things have to be removed to replace the timing chain guides/belts...he would also do some other work (I think it had to do with gaskets/valves). My question is....on this site, it appears that the timing chain guides/belt should be serviced at around 100K -- my car only has 75K. Should I go ahead and do it now despite the fact that things are fine -- or should I wait. Thoughts on this are much appreciated!!!! thx.