Want this question answered?
Timing belt.
how to change the timing belt on a 2003 jetta
You should change the timing belt on a 2003 when it wears out or breaks. Changing the belt beforehand is not needed.
timing chain
A 2003 Impala does not have a timing belt. It has a chain.
how to change timing belt for 2003 1.8 liter turbo volkswagon engine
Chain.
Every 100,000 miles is recommended.
The timing belt on a Dodge Neon should be replaced every 100,000 miles.
Chain
The 2003 Chevy Trailer Blazer doesn't have a timing belt.
All 2003 Ram gasoline engines have timing chains. The diesel has timing gears.