时光飞逝，转眼又快10年了，正考虑换第二根timing belt了。ChatGPT的答案是，即使低里程，10年以上最好换

Even with low mileage, a timing belt should be replaced if it's over 10 years old. Rubber deteriorates with age, regardless of mileage, and an old belt can snap unexpectedly. Most manufacturers recommend changing the timing belt based on time or mileage, whichever comes first.

If your car is over 10 years old but has less than 50,000 miles, it’s still a good idea to replace the belt to avoid costly engine damage. Checking for cracks, fraying, or brittleness can also help determine if it needs immediate replacement.