Rein Engine Coolant Thermostat - F25 F26 - N55 11537586784

Engine Coolant Thermostat - F25 F26 - N55

Maintain exact control over your N55’s operating temperatures under demanding street and track conditions with this Rein replacement thermostat unit. Engineered to match factory standards, this complete housing and thermostat assembly ensures your cooling system handles thermal loads flawlessly to prevent heat soak or dangerous overheating.
Rein Rein
T#: 55965845 | Part#: 11537586784
2X Entries Into Our F80 M3 Sweepstakes
Checking Vehicle Fitment...

Please ensure your correct model is selected

Does NOT fit your Change Vehicle

Fits your Change Vehicle

Change Vehicle

81.69
SALE: $81.69 (5% OFF)
WAS: $85.99 on 08-31-2026

This product was last offered at the strikethrough price on
08-31-2026

Free Shipping on orders $49 and up
Availability:
Ships Directly From Supplier
Est. Ship Date:
in 3 Business Days
Qty
Add to Wish List
Facebook Twitter Pinterest Google+ Email Price Alert
Engine Coolant Thermostat - F25 F26 - N55
$81.69

Maintain exact control over your N55’s operating temperatures under demanding street and track conditions with this Rein replacement thermostat unit. Engineered to match factory standards, this complete housing and thermostat assembly ensures your cooling system handles thermal loads flawlessly to prevent heat soak or dangerous overheating. Perfect for keeping your high-performance BMW X3 or X4 running at peak mechanical efficiency, this direct-fit component drops into place without modification and provides the dependable reliability your ultimate driving machine requires.

Features

  • Direct-fit replacement for the original factory assembly

  • Helps eliminate prolonged warm-up periods and overheating issues

  • Manufactured using high-quality composite material to resist cracking and warping

  • Includes integrated thermostat, housing, and sealing gasket for a complete job

  • Restores factory-specified engine cooling performance and efficiency


Prop 65 WarningProp 65 Warning

Cross Reference
  • 11537586784
  • CTA0083

Product Q&A

Lifetime Replacement

This product is not eligible for Lifetime Replacement
MAKE MODEL SUBMODEL ENGINE Special Fitment Notes
BMW F25 xDrive3.5i N55 3.0L Use vehicle selector to confirm fitment
BMW F26 X4 M40iX N55 3.0L Use vehicle selector to confirm fitment
BMW F26 X4 xDrive35i N55 3.0L Use vehicle selector to confirm fitment
*The above product applications have been written by Turner Motorsport. All warranties, product application, fitment, and performance are the responsibility of Turner Motorsport. For additional information see the terms of use.