Now don't quote me
but I'm sure they just looked at your mileage and told you that, unless they actually CHECKED the fluid.
The
S&MG should give you a pretty good idea of what they are looking at even though the link is for a 2K7 model. I didn't notice any difference in the schedule between first and second gen Xs, when XterraParts was hosting all of the S&MG files along with Warranty files (one, for each year of the X, of many files I had lost in beta testing of WHS).
Tranny, Differential, Transfer case and Radiator are all at the same time (30K each time i.e. 30, 60, 90, 120/timing belt change). I personally have my personal ESM files hosted using M$ Live Mesh sych to track any notes/changes to the file I need to maintain. Very helpful if you find out after market numbers and want to maintain a current part number at your local part dealer.
I also use M$ Mesh for hosting my MPG/Maintenance log to make changes on the road. Can you tell I have lost too many files over the years???
I would suggest at least one copy of the MA section as a reference, I know I have at least 3 copies within my X due to duplication.