The truck has 94000 miles and has been treated gently with soft starts. When toeing, it pulls a 25 foot Fleetwood trailer with no slide-outs that is well under the capacity of the truck. It had the original fill of oil until a month ago. It was serviced at a local dealership and refilled with factory specked oil. Severe cold weather is what caused the damage. The truck is housed in a small barn with no heat. I do often use the block heater during the winter but that is of no help to the transmission. I ride a motorcycle year around unless there is ice or snow on the road in which case the truck comes out. It is also sometimes used on Sundays.