WCE S63 TU4 Billet Coolant Reservoir Expansion Tank - F90 M5 / F92 M8
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WCE S63TU4 Billet Coolant Reservoir Expansion Tank — F90 M5 / F92 M8
The OEM plastic expansion tank on the S63TU4 is a known failure point. It cracks, and when it does it dumps coolant straight down onto the injectors and coils — which turns a cheap part into an expensive weekend. Swapping in another factory plastic unit just resets the clock on the same failure. This one doesn't fail.
Machined from 6061 billet aluminum, the WCE reservoir is a permanent fix rather than a replacement interval. Every factory interface is retained — quick-connect fittings, OEM pressure cap, and the stock coolant level sensor — so the car sees exactly what it expects. No warning lights, no phantom level readings, no adapters or splicing.
Highlights
- 6061 billet aluminum, CNC machined
- Permanently eliminates OEM plastic reservoir cracking and coolant leaks
- All OEM quick-connect fittings retained — no modification to hoses or lines
- OEM pressure cap retained, factory pressure relief preserved
- OEM coolant level sensor retained for accurate readings and no dash lights
- Plug and play — no cutting, drilling, or tuning required
Specifications
| Material | 6061 Billet Aluminum |
| Manufacturing | CNC Machined |
| Engine | S63TU4 |
| Cap | OEM Retained (pressure-rated) |
| Sensor | OEM Coolant Level Sensor (reused from stock unit) |
| Installation | Plug & Play — No Modifications Required |
| Included | Billet Reservoir |
Installation Notes
Transfer the OEM coolant level sensor probe and the factory coolant cap from your original reservoir — both are reused on this unit. The cap does not need to line up with the arrows; tighten until snug. The sensor probe occasionally binds on removal; trimming around its base is sometimes necessary to pull it cleanly. Reservoir only — sensor and cap are not included. Sensor and O-Ring reused from stock unit.
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Shipping Information
We ship fast and nationwide. Most in-stock items leave our SoCal warehouse within 1–3 business days. You'll get tracking as soon as it’s on the way. Need it quicker? Expedited options are available at checkout.
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Customer Support
Questions about your order? Our support team is here to help every step of the way. Reach us by email or DM.
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Contact Us
Whether it’s about your order, install guidance, or wholesale inquiries, don’t hesitate to reach out.
📞 Phone: +1 (949) 371-5212
📧 Email: orders@legendaryautobuilders.com
📍 Visit Us: 21087 Commerce Pointe Drive, Walnut, CA 91789We’ll always do our best to get back to you quickly and take care of you the right way.
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FAQs
Do you offer financing or payment plans?
Yes. At checkout, you can use Shop Pay Installments or Affirm to split your purchase into easy monthly payments. Financing options, including potential 0% interest plans, are shown during checkout and are subject to approval.
Will this part fit my BMW?
Yes. Every product we sell is verified for specific BMW models and chassis. If you want extra peace of mind, you can send us your model, year, or VIN and our team will personally confirm fitment before you order. BMW fitment accuracy is a priority at Legendary Auto Builders.
Are your parts OEM-quality or aftermarket replicas?
We only carry high-quality aftermarket parts that meet or exceed OEM standards. Each product page clearly outlines materials, construction, and finish so you know exactly what you’re getting. We do not sell low-grade replicas or poorly made components.
Where do you ship from and how long does shipping take?
Most in-stock orders ship from our California warehouse within 1–2 business days. Standard U.S. delivery typically takes 3–7 business days depending on location. Made-to-order or specialty items may require additional production time, which is always noted on the product page.
Can I install this myself, or do I need a professional?
Many of our products are designed for direct bolt-on installation and can be installed at home with basic tools. For more complex parts—such as aero components or performance upgrades—we recommend professional installation for best results. If you have questions about install difficulty, just reach out.
What happens if the part doesn’t fit my vehicle?
If there’s a fitment issue due to an error on our end, we’ll make it right. Our team will help resolve the issue quickly, whether that means an exchange or another solution. Fitment accuracy matters to us, and we stand behind the products we sell.
Are your products tested for quality and durability?
Yes. All products go through quality checks and are sourced from trusted manufacturers. We work closely with suppliers and installers to ensure every part meets our performance and durability standards before it ever reaches your car.
Do your products come with a warranty?
Most items include a warranty covering manufacturing defects. Warranty length and coverage details vary by product and are listed on the product page. If you ever have a concern, our support team is here to help.
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