Original BMW Coolant Pipe, Intake System to Expansion Tank, for BMW 540i, 640i xDrive Gran Turismo, and 740i (2016–2020)

This Original BMW coolant pipe, part 17-12-8-602-646, runs between the intake system area and the coolant expansion tank on the B58 six-cylinder in the 2016–2020 BMW 540i, 640i xDrive Gran Turismo, and 740i. BMW calls it the pipe, intake system to expansion tank, and it weighs 31 g (1.09 oz). Production of this number began in July 2015, and it is made in Poland. Coolant pipes of every kind carry coolant between the parts of the cooling system, and over time they can crack, swell, leak, or simply deteriorate from heat and age. When this pipe is replaced, a coolant flush and refill is recommended to clear out any sludge that has built up in the system.

Original BMW Parts carry a 24-month parts warranty.

BMW applies this pipe only to B58-engined cars in the G-chassis 5, 6 Gran Turismo, and 7 Series, so the four-cylinder 530i and the hybrid models in the same body styles do not use it. Since it is a single part number with no left or right version, the main things to match are the engine and the model year. Older B58 cars from the start of production share it, as BMW shows no earlier number being replaced.

Technical Details

• Manufacturer: BMW (Original BMW Parts)
• Part number: 17-12-8-602-646
• BMW part name: pipe, intake system to expansion tank
• Weight: 31 g (1.09 oz)
• Production start: July 2015
• Country of manufacture: Poland
• Engine: B58 six-cylinder
• Sold as one piece
• Warranty: 24 months

Common Questions

Does this pipe fit a four-cylinder 530i?
No. BMW uses it only on B58 six-cylinder cars, so the 530i is not covered.

What are the signs this pipe has failed?
Cracking, leaking, swelling, and general deterioration of the pipe are the usual signs that it needs replacing.

Should I service the coolant when fitting it?
Yes. A coolant flush and refill is recommended at the same time to remove any sludge.

Fitment & Compatibility

Compare your production year and trim against the table below. PMB Performance has spent over 20 years matching parts to vehicles and can verify this against your VIN.