An independent mechanic told me he serviced a Toyota pickup with the 4.7 V8 engine at 250K miles, one owner. He discovered that the timing belt and associated bits like the water pump had never been serviced or changed out. The belt looked a bit frayed with the occasional belt tooth partially missing or damaged but still the belt was working.
The owner had the plugs changed by a mechanic and 100K but passed on any other work. He also changed the Castrol GTX 5w-30 oil every 3K miles himself and changed the Toyota pink with Toyota pink from the dealer with just a drain and refill every 50K, that is not all the coolant was changed at any one time. He did the same drain and refill with the automatic transmission fluid using Castrol Transmax.
So, it the usual 100K or so belt life a very conservative interval?
The owner had the plugs changed by a mechanic and 100K but passed on any other work. He also changed the Castrol GTX 5w-30 oil every 3K miles himself and changed the Toyota pink with Toyota pink from the dealer with just a drain and refill every 50K, that is not all the coolant was changed at any one time. He did the same drain and refill with the automatic transmission fluid using Castrol Transmax.
So, it the usual 100K or so belt life a very conservative interval?