They like to be driven, Ill give an example. A friend of mine has a 97 F250 7.3 auto, has 350,000 miles +, Dailey drives it and has never had a problem with the engine or transmission. Now my Fathers truck is a 97 F250 7.3 auto, has 135,000 miles and never gets driven. He babies it and only drives it when he needs to pull something or when the 2 wheel drive ranger cant get around because of snow or w.e. Dads Truck is basically falling apart. The truck has a miss and has many small problems and it was babied it whole life, he bought it brand new off the lot. Now i know there are alot of variable and this isnt that great of an example but i can name about 4 other instances where the same thing has happened. It just seems to me that the more you drive it the better they run unless you totally just beat the living piss out of it. Just my opinion, take it for what its worth.