Bought a 2006 wrx about 8 months ago, and just crossed 60k miles. I had heard that it was a good idea to replace the timing belt/chain at this mileage so I called up my dealership. Service desk said that for my engine (2.5L) the belt is good till 105k, but that the 60k mile maintenance is still a very good idea (of course). Basically he said for $600USD they flush all fluids, replace spark plugs (buried by the turbo? and platinum tipped), and tighten belts. Is this service worth it, or if my car is running smoothly do I skip this? (No immediate plans to tune/upgrade, but maybe in a year or two.) Thanks in advance!