Description

RK Autowerks Billet Coolant Reservoir, BMW – G42 G20 G22 G26 G29 Supra B58 Gen2 17138610652

ANTICIPATED TO START SHIPPING END OF MAY 2026

Billet reservoir designed and machined in house to remedy the failing stock plastic reservoir. Our all metal construction reservoir ensures leaks are not an issue anymore. Constructed of 6061 billet aluminum, you know you have a lifetime product and don’t need to worry about leaks anymore. Utilizing the stock cap also retains the pressure bleed off like designed by the OEM. All of the OEM connecting points are utilized and the quick connect fittings slip right on. This is a plug and play solution which even utilizes the stock sensor ensuring there won’t be any issues with level readings.

Why?

The OEM plastic reservoir is known to leak causing damage of the injectors and coils. This leads to vehicle downtime and potential engine damage. Simply replacing the OEM reservoir with another one is an unknown with how long it may last.

Features:

1. 6061 billet CNC construction
2. OEM factory cap retained
3. OEM connections utilized like stock
4. OEM sensor utilized for level reading
5. O-ring housing for OEM O-Ring off Stock Reservoir
6. Internal baffling to dampen fluid transfer throughout the reservoir
7. 1/8 NPT provision for external sensor
8. Relocated bleed off section along with additional port for external bleeding

Pricing

• MSRP $999.99

Models Supported

• 2′ G42   (06/2020 — 03/2025)
• 3′ G20 Sedan   (10/2017 — 06/2022)
• 3′ G20 Sedan LCI   (07/2021 — 03/2025)
• 3′ G28 Sedan   (01/2018 — 09/2022)
• 3′ G28 Sedan LCI   (07/2021 — 03/2025)
• 3′ G21 Touring   (05/2018 — 06/2022)
• 3′ G21 Touring LCI   (07/2021 — 03/2025)
• 4′ G22 Coupé   (06/2019 — 02/2024)
• 4′ G22 Coupé LCI   (01/2023 — 03/2025)
• 4′ G23 Convertible   (10/2019 — 02/2024)
• 4′ G23 Convertible LCI   (02/2023 — 03/2025)
• 4′ G26 Gran Coupé   (09/2020 — 07/2024)
• 4′ G26 Gran Coupé LCI   (06/2023 — 03/2025)
• Z4 G29   (10/2017 — 03/2025)

Part number: 17138610652 replacement

Notes

• The customer will have to re-use the stock coolant sensor probe and the OEM gas cap (Please note that the arrows do not have to align, screw it on until it is tight and it will be okay) , which pulls out of the OEM reservoir. In certain cases, it does not slide out smoothly and you may need to trim around the sensor to remove it. We do include the O-ring for that sensor in the package as well.