* If it has a timing chain: Timing chains are generally much more durable than timing belts and are designed to last the lifespan of the engine. They rarely need replacing unless they start to make noise (rattling, clicking), show significant wear (which is rare and usually accompanied by noise), or fail completely (a catastrophic event). There's no mileage-based recommendation. Focus on listening for unusual noises from the engine.
* If it has a timing belt: This is much more common in some engines. A timing belt typically needs replacement every 60,000 to 100,000 miles, depending on the engine and manufacturer recommendations. Refer to your owner's manual for the exact recommended interval for your specific engine. Failure of a timing belt can cause catastrophic engine damage.
In short:
* Check your owner's manual: This is the single best source of information. It will state definitively whether you have a timing chain or belt, and if a belt, the recommended replacement interval.
* Listen for unusual noises: A rattling or clicking sound coming from the engine compartment *could* indicate a worn timing chain (or other problem). If you hear this, get it checked by a mechanic immediately.
* Consult a mechanic: If you're unsure about the type of timing system or its condition, a qualified mechanic can inspect it and advise on whether replacement is needed. Don't risk engine damage by delaying necessary maintenance.
Ignoring a failing timing *belt* is far riskier than a failing timing *chain*. A broken belt will usually result in significant engine damage, while a broken chain is less likely to cause immediate catastrophic failure (though it still needs fixing promptly to prevent further damage).
