O-Ring For Coolant Tubes - 22X2mm - E60 M5, E63 M6, E90,E92,E93 M3

This part is listed by BMW as BMW part number 11537835497 (11-53-7-835-497) and is described as Genuine BMW O-Ring (22X2mm) for coolant pipes on  E60 M5, E63/E64 M6, and E90/E92/E93 M3. 

E9X M3 uses 1 of these o-rings to seal the coolant pipe to the front of the S65 V8 engine block.

E60 M5 and E63 M6 use 4 of this o-ring to seal the ends of the short coolant tubes between the thermostat housing and the engine block.  The S85 engine also has 1 more o-ring sealint the coolant tube to the front of the engine block.  In total, V10 models use 5 of this item per car.

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