Shop OEM BMW Part # 11287631817 (11-28-7-631-817, 11287516621, 11287525418, 11287529741, 11287539831). Serpentine Belt. 4.4 & 4.8 LITER. 545i; Water Pump & Alt. 550i. 550i; w/o GT. 550i; Water Pump & Alt. 645Ci. 650i. 745i, 745Li; Water Pump

Alternator Belt. Ribbed v - Belt. Serpentine Belt.
Routing:Crk,Tens,Wp,Idler,Alt,Ps. Serpentine Belt.

Serpentine Belt

4.4 & 4.8 LITER. 545i; Water Pump & Alt. 550i. 550i; w/o GT. 550i; Water Pump & Alt. 645Ci. 650i. 745i, 745Li; Water Pump & Alt. 750i, 750Li; Water Pump & Alt. 760i, 760Li; Water Pump & Alt. X5; 4.4L. X5; 4.8L.
Drive Belt - Repair or Replace
A failing drive belt could affect the performance of your vehicle's auxiliary systems, not to mention a loud squealing sound from under the hood. Consider having having your drive belt inspected or replaced to keep your running at its best.