If you kep up on the maintenance it can go a LONG way. So many factors could effect the life of your motor, so you need to be concerned with all the ones you can effect. If you don't make "Jack Rabbit" starts off red lights, drive it as transportation and not NASCAR, and regularly change the oil and keep it tuned up it will last a good long time. I have a Pontiac with 160,000 miles on a 3.8 that runs like a clock, but I don't beat on the car, and I keep up with the essential maintenance.
Replace it every 50,000 miles.
100 to a 150 thousand miles is a good time
It all depends on the motor and battery that you use
70,000 miles
replace when bad
When changing oil in any vehicle a rule of thumb many people use is to change the oil every 3,000 miles from when it was last changed. There is an exception however if you use synthetic motor oil such as mobil 1 or valvoline extended performance (metallic red bottle). When using synthetic motor oil many people drive up to 5,000 miles before changing the oil. You also want to remember to always change your oil filter when you drain and replace the oil.
If the head(s) were checked and had no cracks and the coolant never mixed with the motor oil it could last for many miles depending on how many miles allready on the engine.
I would replace them at 75,000 miles. It's recommended that you change them every 30, 000..
You don't check it you replace it. 1990-97 Replace at 60,000 miles 1998 Replace at 75,000 miles 1999 up Replace at 100,000 miles
120,000 miles , inspect and replace if necessary ( but I see another person has answered that their belt broke at 110,000 miles )
I was told by my mechanic to replace the timing belt once you've reached 100k miles. I was told by my mechanic to replace the timing belt once you've reached 100k miles.
No way of knowing. It depends on the maintenance and care it has or has not received.