I'm the original owner of a 2001 Explorer XLT, 4-door, V6 4.0, that just turned 100,000 miles. I've had the regularly scheduled maintenance items done mostly at the dealer (oil changes every 3k, transmission fluid and filter changes every 15k, all 30K services), replaced the brakes a couple of times and just replaced the rear differential. She still runs great and I hope to get another 50k/3 years out of her.