Original BMW Automatic Transmission Cooler X-Ring for BMW 5, 6, 7 Series, X5, and Land Rover Range Rover (2000–2010)

Where the automatic transmission oil cooler meets the radiator, this Original BMW X-ring forms the seal on the 2000–2010 BMW 5 Series, 6 Series, 7 Series, and X5, plus the 2003–2005 Land Rover Range Rover. BMW sizes it 16.5 x 4.8 x 23 mm, and the ring weighs 1 gram (0.04 oz). BMW has produced this part since September 1999. An X-ring has a four-lobed cross section instead of the round profile of a standard O-ring, which gives it two sealing edges on each face and a lower tendency to roll in its groove.

Part number 17-10-1-439-140 runs across a long list of BMW engines in the cars covered here, including the M54, M62, N52, N52N, N62, N62N, and N73. That spread of six-cylinder, eight-cylinder, and twelve-cylinder engines all shares the same cooler seal, so engine choice does not change the part.

Technical Details

• Manufacturer: BMW (genuine part)
• Part number: 17-10-1-439-140
• BMW part name: X-ring
• Size: 16.5 x 4.8 x 23 mm
• Weight: 1 g (0.04 oz)
• Production start: September 1999
• Location: automatic transmission oil cooler to radiator
• Sold individually, priced each

Common Questions

Can I use a standard O-ring here instead?
BMW specifies an X-ring for this joint, so a round O-ring of similar size is a different part and not the factory seal.

Is this X-ring made by BMW?
Yes. It is a genuine BMW part made in Germany.

Fitment & Compatibility

Check the table below for the exact year, model, submodel, and any listed notes. PMB Performance has spent over 20 years matching parts to vehicles and can verify this against your VIN.