The one I replaced is Part# 11 31 7 531 813. This one costs $55 and can be had here: at X5 Engine Mechanical & Under Hood Parts
There are other tensioners, but there is NO access to them without tearing down the engine - this is the only one you can replace to help prolong the life of your engine and timing chain guides.  Wise investment, IMHO.
UPDATED.
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740iLDUKE
01' DINAN 7 S62 Swap - Stratus Grau
(1587 produced in SG 440)
02' 4.6is DINAN X5 S2 Supercharged
833/3258 produced | 1/27 Dinan X5's
Last edited by 740ilDuke; 11-09-2011 at 08:36 PM.
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