Never, it is designed to last the life of the engine and is normally replaced when the engine is overhauled.
The timing belt should be replaced every 100,000 miles.
It has a timing belt that should be replaced every 90,000 miles. The water pump should also be replaced as it is driven by the cam belt.
never needs to be replaced
It doesn't have a timing belt. It has a timing chain and it will last the life of the engine.
the manufacture reccomends it be replaced in 90,000 miles
Timing chain usually needs to be replaced each 180-200K miles.
A loose timing chain should be replaced.
At around 90000km timing belt should be replaced!
The 330xi has a timing change that doesn't need to be replaced.
Timing belts on these cars are usually replaced every 90K; you don't want to have a timing belt go while you are driving... :(
This truck has a timing chain, not a belt. The chain will last longer than a belt and should not be replaced until it fails.
Timing belts for most vehicles are supposed to be replaced at 60k. Some vehicles at 90k.