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If you're replacing the drive belts on your 2008-2013 BMW M3 (E90 M3 sedan, E92 M3 coupe, or E93 M3 convertible), which has the S65 V8 engine, then you should also be looking at replacing the belt pulleys.
This is the tensioner pulley used for the main drive belt (water pump, power steering pump, and alternator). With more mileage comes more wear on the bearings inside the pulley. Don't get stuck with a new belt but bad bearings on your S65 powered M3! A complete belt service should include a new pulley and tensioner.
BMW Fitments:
3 Series E90 / E91 / E92 / E93 (06-13) > M3
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$202.20
Belt Tensioner Pulley with Lever - E9X M3 - 11287838194
Don't get stuck with a new belt but bad bearings!
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