On a number of engines that I worked on over the years, many were found to have the degree marks on the crank pully (vibration damper) off by as much as 8 degrees. This was with american manufacturers,dont know if the foreign ones have the same problem. I will have to check my 01 tomorrow to see how accurate it is.
Not the first time this board has caused me to go out to check stuff. Curiosity is sometimes a good thing.