My titan is 4 yrs old and has 36000. Every time I go in to get my oil changed the dealer keeps saying that I'm over due on the 30000 service. They want 690.00 which I think is just insane. Now I'm using the schedule 1 on the maintenace guide and it never states when should I change the transmission fluid, it only say to check it or only to change it if i tow. The only towing that I do is taking my 4-wheeler to get service once or twice a yr and only weighs maybe 1300 with the trailer too. The only fluids that I think that I need to change are the oil of course, the coolant, and rear diff (hence all of the rear diff failures). What do ya'll think?