Plenty of things need changing on a schedule. Timing belts, chains tensioners. Most radiators only have about a 6 year life. You purchased both those vehicles way beyond the life you reckon they have. IF you intend to run HIGH miles find out what servicing is needed to do it. Nothing runs forever without attention. IF something PLASTIC melts it's probably overheated. IF you want something to run forever drive a Gardiner and hold up all the traffic. and cover the vehicles behind in soot.. These things are putting out a lot of power. Land cruisers used to warp and crack heads when they DIDN'T put out a lot of power,.. Nev