There is a myth that, because German vehicles are over-engineered and have better build quality than most, the timing belt replacement interval can be extended to 10 years. This is very poor advice and very risky.
A timing belt can sometimes last 10 years, especially on a low-mileage vehicle, but that does not mean it should be trusted. Timing belts are made with reinforced rubber, and rubber ages even when the vehicle is not driven. Heat, moisture, oil leaks, coolant leaks, and prolonged sitting can all weaken the belt. Some manufacturers list a time interval as well as a mileage interval, while others focus mainly on mileage. These intervals are determined after extensive testing and should not be ignored. If the belt is near 10 years old, check the maintenance schedule and service history, then plan replacement unless the manufacturer clearly allows more time. Age-related failure can occur suddenly and may cause expensive engine damage on many vehicles today, without warning. Most German auto engines are interference fit designs, and if the timing belt breaks, the engine will suffer catastrophic damage.
If you have timing belt problems in Ann Arbor or nearby, call Stadium Auto Service at (734) 369-6787, make an online appointment, or visit the shop. We have technicians who specialize in timing belt diagnosis and repair exclusively on Audi, BMW, Mercedes-Benz, MINI, Porsche, and Volkswagen.