I have a Optimax service manuel for Optimax and on the cover it says starting year 2000~~all specs inside show only 2000 and 2001. I may have bought it new in 2001 for my 01 Optimax, so my question is everything basically the same from 01 to 2012 on Optimax? If yes I will keep it, if I can't use it for my new 2012, I'll post it for sale.