Thank you for thinking about this issue Mr.
Avulon and using some very appropriate words.
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Originally Posted by Avulon
... the replacement by time and mileage are both set depending on the predicted mean average between failures ...
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You're possibly right. It's easy to test timing belts to destruction on mileage but as for the time period alone ...
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... Rover didn't make this engine for long enough to get any real significant numbers for low mileage cars over 6 years old did they? So without those numbers being available what are you going to trust?
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Exactly! The answer is that you trust the mileage, as I have argued and proven with my own vehicle.
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Now when a car is first built it's all educated guessing and design driving these figures but as the cars age and some real world numbers are available these figures can be refined ..
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A good example of this is the initial requirement to change all the airbag components after ten years; clearly a "cover our backs" policy with no scientific basis whatsoever. If this can be true for airbags, it can also be true for timing belts.
Simon