I had an '85 toyota 4wd pickup. I really beat the frigging snot out of it, bad, but changed the oil religiously. I put close to 200,000 on it, blew the engine and still managed to sell it for over $1000 8 years after I bought it.
The only repairs were a head gasket and bodywork, all of which I did myself. (of course brakes, shocks, and tires, etc got replaced)