is time or mileage worse for drive belts and serpentine belt in a 2006 toyota 4 runner with 56,000 miles
11 year old belts should be replaced regardless of mileage.
Absolutely time in this case. Rubber deteriorates over time whether you use it or not. Tires are a very good example of this. You can have a set of 10 year old tires with 20,000 miles on them that are just as unsafe because of dry rot from sitting as a set of 3 year old tires with 60,000 miles that are bald from use. Belts and hoses are the same! HTH. -Jim
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