it does not have a timing belt, it is a chain drive which should be good for the life of the car
The 3.8 liter V6 engine has a timing CHAIN
On a 2008 Chevrolet Cobalt : The 2.2 liter ( and 2.4 liter ) four cylinder engines have a ( timing CHAIN )
If the engine has a timing belt, it should be changed around the 150K mark. If there is a timing chain, it does not have to be changed unless it is damaged.
timing chain ( on the 2.8 liter 4 cylinder diesel and the 3.7 liter V6 gas )
NO, That should last the life of the engine.
you did not mention the kind of car. Most generally the chain should not have to be changed until it is noisy or giving a problem.
The 2.0 and 2.3 liter four cylinder engines in a 2007 Ford Focus have timing CHAINS
You should have a timing chain not a belt on that 3.0 liter motor. They last 300k or more and rarely ever have to be changed
Should be changed around every 100,000 miles.
You don't say which engine you have but the 1.8 liter four cylinder , the 2.0 liter diesel four cylinder , and the 2.8 liter V6 engines have a timing BELT
It must be a timing CHAIN because the Gates website does not list a timing belt for the 4.8 liter V8 engine in a 2007 BMW 650I
You dont it as timing chain