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I replace things in vehicles the same way the aviation industry does. Which is to say that most of it is done "on condition". Infant mortality of parts is something to consider, so is maintenance induced failure. A proven piece of equipment that is functioning properly is a known quantity...A new part and installation is an unknown quantity. That being said, there are "life limited" parts on any vehicle: Timing belt/chain/tensioner, spark plugs, filters, fluids, etc...
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