Original BMW Thermostat Housing O-Ring for BMW E28 M5 and E24 M6 (1987–1988)

For the S38 six-cylinder in the 1988 BMW E28 M5 and the 1987–1988 E24 M6, Original BMW O-ring 07-11-9-906-322 seals the engine coolant thermostat housing. It measures 65 x 3.55 mm and weighs 3 g. BMW names it simply an O-ring, and this number entered production in March 2008 as the current replacement for the thermostat housing seal on these cars. It is sold one O-ring per order.

Original BMW Parts carry a 24-month parts warranty.

A thermostat housing O-ring sits between the housing and its mating surface and keeps coolant from weeping past the joint as the system heats and pressurizes. This number replaced the earlier BMW part 07-11-1-304-202, and BMW rates the change as exchangeable retrospectively, so it fits engines built with the older seal. BMW's parts data ties it to the S38 engine family, which covers the E28 M5, the E24 M6, and the M635CSi. The same seal also appears outside the car range, on the M1 and on several BMW motorcycles, including the K 1600 and S 1000 XR models.

Technical Details

• Manufacturer: BMW (Original BMW Parts)
• Part number: 07-11-9-906-322
• BMW name: O-ring
• Position: engine coolant thermostat housing
• Size: 65 x 3.55 mm
• Weight: 3 g (0.11 oz)
• Production start: March 2008
• Replaces: 07-11-1-304-202
• Sold as: single O-ring
• Warranty: 24 months

Common Questions

Does this replace the older thermostat seal number?
Yes. It replaces 07-11-1-304-202, and BMW rates it as exchangeable retrospectively.

What size is it?
65 mm by 3.55 mm.

Which engine does it fit?
The S38 in the E28 M5 and E24 M6.

Fitment & Compatibility

Check the table below for the exact year, model, submodel, and any listed notes. Send your VIN and PMB Performance will confirm the fit, drawing on more than 20 years in the trade.