Turner Motorsport Turner Motorsport Billet Oil Cooler Thermostat - F8X S55 (With -10 AN Oil Cooler Lines) 059170LA01

Turner Motorsport Billet Oil Cooler Thermostat - F8X S55 (With -10 AN Oil Cooler Lines)

Heat is the enemy of lap times and engine longevity. BMW calibrated the factory oil thermostat on the N54, N55, and S55 platforms for rapid warm-up and emissions targets, running oil temperatures uncomfortably hot under prolonged load. When you’re pushing full throttle down the straight or stacking laps in midsummer, you need thermal headroom long before factory thresholds are reached.

The Turner Motorsport Oil Cooler Thermostat Housing drops your thermostat threshold to 70°C, circulating oil through the cooler early to build a buffer against heat saturation. Engineered for hard-driven road course and track day cars, the housing is protected with a Type III black hardcoat anodized finish for maximum resilience against thermal cycling and harsh track environments. Build flexibility is built right in: retain your OEM hard lines for a simple, direct-fit cooling upgrade, or adapt to full braided lines using our Turner AN Adapter for dedicated competition oiling systems.

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T#: 59331100 | Part#: 059170LA01
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Turner Motorsport Turner Motorsport Billet Oil Cooler Thermostat - F8X S55 (With -10 AN Oil Cooler Lines) 059170LA01
Turner Motorsport Billet Oil Cooler Thermostat - F8X S55 (With -10 AN Oil Cooler Lines)
$429.99

Keep your S55 running cooler, longer. The factory oil cooler thermostat on the S55 waits until the oil reaches roughly 110°C (230°F) before sending it to the cooler. By then, the cooling system is already playing catch-up, especially on track days, spirited canyon runs, hot summer traffic, or tuned cars making well beyond stock power.

Our S55 Billet Oil Cooler Thermostat design addresses this issue at the source. Our proprietary low-temperature 70°C (158°F) thermostat routes oil through the cooler much earlier, so temperatures stay controlled before they climb instead of being pulled back down after the fact. The result is more consistent oil temperatures, more stable performance lap after lap, and less heat stress on bearings, turbochargers, and other critical components.

Unlike thermostat delete or “always open” bypass solutions, our kit uses a real working thermostat. Your engine still warms up properly on cold starts, which protects internal friction surfaces and keeps the oil at the right temperature for daily driving in any climate. Housing the thermostat is a CNC-machined billet aluminum cover, which is much stronger than the factory piece and looks great under the hood. Our thermostat solution is compatible with -10 AN oil cooler lines thanks to the provided AN Line Adapter.

Features & Benefits:

  • Low-temperature 70°C (158°F) thermostat vs. factory 110°C (230°F)
  • CNC-machined billet aluminum thermostat cover
  • True thermostat design, not a bypass, so the engine still warms up properly
  • Earlier oil flow to the cooler for more consistent oil temperatures under hard use
  • Ideal for track, performance driving, hot climates, and tuned S55 builds
  • Direct bolt-on replacement for the factory unit
  • Serviceable thermostat and gaskets

Kit Contents:

  • Turner Motorsport Billet Aluminum Oil Cooler Thermostat Housing
  • Turner Motorsport Performance Oil Cooler Thermostat (70°C [158°F])
  • Turner Motorsport Performance Oil Cooler Thermostat Spring
  • Turner Motorsport -10 AN Fitting Adapter

Product Development:

​Our Billet Oil Cooler Thermostat was designed, engineered, tested, and quality-inspected by our Research and Development team at our Wadsworth, Ohio, facility. We strive for the highest level of precision and quality through leading-edge product development technology, including FARO laser scanning for reverse engineering and quality inspection, SolidWorks 3D CAD modelling, rapid prototyping utilizing our in-house 3D printer, and rigorous long-term product testing.

Installation & Support:

- Click HERE For Installation Instructions -

 

Prop 65 WarningProp 65 Warning

Cross Reference
  • 11427850293
Qty Description Brand T# Part# Lifetime
1 Elring Oil Cooler Gasket - N52 N54 N55 Elring T#363983 11428637820~ELR YES
1 N54/N55 Oil Cooler Thermostat - 70 C Turner Motorsport T#23383295 T1285-70~TMS YES
1 Low Temp Thermostat Spring Turner Motorsport T#26771722 2710RH11~TMS YES
1 AN Oil Line Adapter Turner Motorsport T#59331096 059170LA02~A NO
1 Blue-Dyed Zinc-Plated Alloy Steel Socket Head Screw, M6 X 1 Mm Thread Size, 65 Mm Long Bremmen Parts T#59331098 91502A177~BRP YES
1 Class 8.8 Steel General Purpose Washer, Zinc-Flake Coated, For M6 Screw Size, 6.4mm ID, 12mm OD Bremmen Parts T#59331097 91455A430~BRP YES
1 Upgraded Oil Cooler Thermostat Housing Turner Motorsport T#59331095 059170LA01~B YES

Product Q&A

Lifetime Replacement

Some kit components are covered by our Lifetime Replacement Program

Products protected by our Lifetime Replacement Program are covered for as long as you own the product, no need to worry about an expiration date. Purchase your products and enjoy some worry-free motoring, knowing we've got you covered.

If you have any questions, would like to learn more or are ready to place a replacement claim, click here!

MAKE MODEL SUBMODEL ENGINE Special Fitment Notes
BMW F80 M3 S55 3.0L Use vehicle selector to confirm fitment
BMW F82 M4 S55 3.0L Use vehicle selector to confirm fitment
BMW F83 M4 S55 3.0L Use vehicle selector to confirm fitment
BMW F87 M2 Competition S55 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.