WCE S63 TU4 Billet Coolant Reservoir Expansion Tank - F90 M5 / F92 M8
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WCE S63 TU4 Billet Coolant
Reservoir Expansion Tank
Plug & Play Replacement — F90 M5 / F92 M8
Designed and machined in-house, this all-metal coolant reservoir permanently solves the cracking and leaking issues of the OEM plastic unit. Constructed from 6061 billet aluminum, it's built to last the life of your vehicle — no more worrying about coolant leaks damaging your injectors or coils. All OEM connections, the stock cap, and the factory coolant sensor are fully retained for a seamless, plug-and-play installation with no warning lights or level reading issues.
Why upgrade?
The factory plastic reservoir is known to crack and leak coolant directly onto the injectors and ignition coils — causing vehicle downtime and potential engine damage. Replacing it with another OEM plastic unit carries the same risk. This billet aluminum reservoir eliminates that problem permanently.
Key Features
Specifications
| Material | 6061 Billet Aluminum |
| Manufacturing | CNC Machined In-House |
| Compatibility | F90 M5 / F92 M8 (S63 TU4) |
| Cap | OEM Retained (pressure-rated) |
| Sensor | OEM Coolant Level Sensor (customer reuses from stock) |
| Installation | Plug & Play — No Modifications Required |
| Included in Package | Billet Reservoir |
Installation Note
The stock coolant sensor probe and OEM coolant cap must be transferred from your original reservoir — both are reused on this unit. The cap does not need to align with the arrows; simply tighten until snug. In some cases the sensor probe may not slide out smoothly and you may need to trim around its base to remove it cleanly. A replacement O-ring for the sensor is included in the package.
