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Belts are a wear item but I'd expect it should go 5years or 100k mi. That said they often get changed before that due to a leaking OFHG and squeaky belt/tensioner. Oil from the OFHG leaks on the belt and tensioner and causes a squeak (or better described as a chirping) sound at idle.
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2011 135i w/ DCT | ZSP Sport Pkg | PPK | Ohlins R
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