Drive belts should be inspected and changed regularly to avoid further complications. We offer Genuine BMW and other aftermarket brands that we trust or know to be OE manufacturers. We like to make it easy on you and do all the research for you - check out our Drive Belt Service kits.
This is an OEM INA Upper Idler Pulley, also known as the roller pulley or deflection pulley. The upper and lower idler pulleys are known to be the primary sources for 'belt squealing'. The pulley is also encased in rubber which will crack over time. If left without service the rubber could fail completely, chucking the belt and leaving you stranded. Replacement is a very simple procedure and can be done anytime the fan is off the engine (belt replacement, water pump service, alternator replacement, etc).
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