My 2005 nissan xterra had just under 100,000 miles on it. the transmission began to slip and there would be no power. i had it towed to nissan and the radiator had leaked coolant into the transmission, destroying the transmission for about a 5,000 $ repair. nissan offered no explanation other than "it happens", and after further research, found that i'm not the only case of this happening. luckily for me, i was on a secluded state road when my transmission first slipped. had i been on a freeway, i would have lost all power in a busy and unsafe location. http://www.carcomplaints.com/nissan/xterra/2005/transmission/radiator_causes_transmission_failure.shtml. *tr