It's also a good idea to get a new bolt from the dealer every time you replace your timing belt. Doesn't cost much and you run a smaller chance of wrecking your crankshaft.

BTW, you should really use the torque wrench when re-torquing that bolt. Otherwise you'll either under- or over-tighten it. Most people will undertorque at 50-60% of spec'd torque. But, but! If they are scared of undertorquing they usually overtorque twice. Not a good thing either. Torque wrench is the only way to get it right.

The jack***es at an unnamed shop used the air wrench when re-torquing my bolt and not only the bolt itself had about 1/5th of a circumference worth of a thread missing at one point (I don't know if it was their doing, but they should have replaced it if they had seen it being like that), moreso it had undone itself 6 months after the timing belt change. Unfortunately, people at 90% of shops are totally ignorant as far as basic mechanical engineering goes...

Especially if your bolt was "seized" it's a good idea to get a new once since you might have really overstressed the old one when removing it. It's a way too critical bolt as far as I'm concerned to simply re-use. As you all hopefully know, cumulative damage cannot be readily assessed until the part fails :) Unless you know the stresses, that is, and I doubt you've instrumented your bolt to see if you didn't overstress it.

Cheers, Kuba