| which are not based on data. Which is what everyone else is doing as well. You seem to be doing the same. For example, you state:
- If the protection is damaged (cracks) then the belt needs to be replaced
- the fibers do not age appreciably without use, and are good for 60k How do you know that? You also assume that whatever the data suggests is exactly what made it into the manual. You cannot say for sure that there is no time limit for changing the belt, you can only say that Nissan deemed it appropriate to put that in there based on whatever criteria they find important. I'm sure there was a balance of cost and reliability.
I have made no claims either way, I'm just saying that I believe you are doing the same thing, drawing some conclusions without data?
I in fact do have experience with making calls about reliability and cost in an engineering setting, using data as a guide. I also have experience with accelerated aging of materials. I'm not saying you are wrong, I'm just saying that you seem to be doing the same thing, just in the other direction. Perhaps I'm wrong.
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20:48:40 12/11/09
