HJ is absolutely right - a decent belt should last the life of the engine. Some years ago I changed a whining tension pulley on our 2.0GL Passat, and left the belt alone for 2 reasons. Firstly, it looked in perfect condition, and secondly it was too difficult for me to change. [ the pulley was easily accessible at the top of the engine]. When I eventually sold it at over 240,000m it was still going strong.....with the original belt.
This cambelt malarkey is a great wheeze to empty the punters' wallets twice. Firstly for an unnecessary belt change...and secondly about 20 or 30,000 miles later when a pulley or other driven appliance seizes and fries or breaks the belt. Or when the replacement inferior belt made of black raffia tears.
You can't even win with chains - they seem to stretch and thrash around causing damage, or put the cam and crank sensors out of synch thus compromising the electronic engine management system. [apparently well known on Nissan Primeras]
If it works, don't mend it!
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