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interference engines
there is no excuse for interference engines. pistons can have grooves in the piston that allows for valve clearance. Then to make matters worse ,they run the water pump off the timing belt. This increases the chance for failure. Now they want you to not only replace the timing belt at regular intervals, but also the water pump. this is poor engineering at best, and possibly planned intimidation to force you to buy replacement parts before you actually need them.
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