My MF2660HD has a nameplate on the engine that has some detail and says Tier something or the other. Worst case, get the serial number of the tractor and email the Massey/AGCO Got Answers site. They are slow but they will eventually get back to you. The more general question (not just your machine but ALL 2008 MF 5445's) would probably get an answer using the same AGCO answers website.