The timing belt should be changed every 60,000 miles. Most belts will still look like new at 60,000 miles. They seem to want to break at 100,000 miles. Nothing bad will happen if it breaks other than...
About every 60,000 miles. For the 1999 and earlier models, the oil pump typically starts to leak around 100,000 miles. The leaking oil contaminates the timing belt and water pump. It is best to have...
The 2004 and later Prius models do not have a timing belt, so the answer for them is "never". They use a chain which should only be replaced when major engine work is done or if it breaks, which...