The local stealership wants $750 for the 30K service... flush and change transmission fluid, radiator, service front and rear diff- which I assume means changing the oil. I currently have about 35K+ miles and I thought these fluids were designed to go a long time like 100K??? I change the oil regularly with Mobil 1 synth. Do these procedures really NEED to be done. I'm not directing this at you folks that sleep with your X's and cover them at night, lol no offense. I do love my X off road!. But I also have 2 little girls and thats a lot of scratch. Is changing the trans fluid the one necessary service? I could also save by going away from the Nissan dealer but is using OEM fluid crucial or would it be the same? Appreciate the help.

Dave in western MA.