I know of someone with a 2002 Mazda Millennia with only 50k on it. The timing belt calls for changing every 100k but I was wondering if age is as much of a factor as mileage. I see no reference to this anywhere but know it applies to tires so why not belts?
Also, I am somewhat worried I may have purchased a Gates “New old stock” belt for another car. It is new in the box but may have been sitting around for a while.
Both these are non-interference engines but a failure would still be inconvenient. Are timing belts much of a concern with age or should one mainly be worried about mileage?