BMW Radiator Expansion Tank Cap Coolant Reservoir, 200Kpa 17137516004

Description

The Genuine BMW Coolant Expansion Tank Cap (OEM Part # 17137516004) is a 2.0 bar (200 kPa / ~29 PSI) pressure-regulating filler cap. Designed primarily for modern BMW chassis configurations, it maintains precise pressure within the engine cooling system to elevate the boiling point of the coolant and prevent localized overheating.

Equipped with internal spring-loaded pressure relief and vacuum valves, this cap releases excessive steam if system pressure exceeds 2.0 bar, protecting the plastic expansion tank, radiator end tanks, and coolant hoses from over-pressurization.

Technical Specifications & OEM Cross-References

Direct Vehicle Fitment

Fits a wide variety of BMW models across multiple series, including naturally aspirated and turbocharged 4-cylinder, 6-cylinder, and V8 engines:

• BMW 1 Series: E82, E88 (128i, 135i, 135is) (2008–2013)

• BMW 3 Series: E90, E91, E92, E93, F30, F31, F34 GT (320i, 328i, 330i, 335i, 335is) (2006–2018)

• BMW 4 Series: F32, F33, F36 Gran Coupe (428i, 435i) (2014–2020)

• BMW 5 Series: F10, F11, F07 GT (528i, 535i, 550i) (2011–2016)

• BMW 7 Series: F01, F02 (740i, 750i, 760i) (2009–2015)

• BMW X Series:

  • X1: E84, F48 (2012–2022)

  • X3: F25 (2011–2017)

  • X4: F26 (2015–2018)

  • X5: E70, F15 (2007–2018)

  • X6: E71, F16 (2008–2019)

• BMW Z Series: Z4 E89 (sDrive28i, sDrive30i, sDrive35i) (2009–2016)

Operational Features

• High-Temperature Seal: Retains cooling system pressure up to 200 kPa, raising the coolant boiling point past 120°C (248°F).

• Dual Valve Mechanism: Integrates an over-pressure safety vent alongside a vacuum recovery valve to prevent hose collapse during cool-down.

• Exact Fitment: Direct replacement requiring no tools—hand-tighten until firmly seated against the filler neck.

200 kPa vs. 145 kPa Pressure Rating Notice