Sorry to dig up an old thread but I just wanted to add my experience if this question comes up again.
For my 2005 obxt, I examined my old bolt before I attempted to reuse it. It was clean and looked straight with no necking. So I decided to reuse it because I needed to drive the car the next day. If any part of the bolt looks thinned/stretched out then you definitely need a new bolt.
Anyway I cleaned the bolt, cleaned the bolt hole as best as I can with a rag, and then rubbed a bit of oil on the bolt thread and torqued it. Mine only rotated 45 degrees to torque to 135ft.lbs after a 35ft.lbs preload.
So I pulled it back out, and this time I dunked the entire bolt in engine oil and then wiped off the excess. Then I tried again. This time it rotated exactly 65 degrees to torque to 135ft.lbs after a 35ft.lbs preload. Success! So, cleaning and oiling the bolt is a necessary step for sure.
Now I am not sure about other engines, but on the TURBO engine, the easiest way to measure the angle is to look for a raised notch in an area right above the timing belt cover just below and to the right of the starter. It is a tiny raised bump about 1 cm long and only about 2 mm wide, but you can tell it is the correct line because it is perpendicular to the crack bolt (the line points to the bolt). The mark is about 10 o clock from the crack pulley. Start your torque wrench there, and then tighten clockwise until you reach the torque. The wrench should stop (click) right at the O degree mark indicated on top of the timing belt cover.
By the way I had to exceed the 300 ft.lbs max torque on my beefy wrench to loosen the crank bolt for the initial timing belt change.