Compact High-Flow Transmission & Engine Oil Cooler Thermostat

Minimum Thermostat Temperature: 145°F
Fitting Type: 5/16'' Barb
$ 166.60


Improved Racing Compact High-Flow Transmission & Engine Oil Cooler Thermostat

  • Performs the critical function of bypassing the cooler until the oil has reached its minimum operating temperature
  • Perfect for engine oil cooling in motorcycles, ATVs, go karts, and other small engines
  • Unique, patented internal design ensures a low pressure drop
  • Standard female -6AN O-ring boss threads and is available with optional fittings in 3/8" hose barb, 1/2" hose barb, or male -6AN fittings
  • Lifetime Warranty. Made in the USA

Features and Benefits

  • Reduces excessive engine wear and horsepower losses while improving gas mileage by preventing oil temperatures from dropping below optimal levels
  • Patented, high flow, low pressure drop design locates the valve assembly completely out of the primary fluid flow
  • Maintains a minimum fluid temperature according to the typical stabilization temp in the table below, +/- 2°F (+/- 1°C)
  • Allows a small percentage (less than 10%) of fluid to continually circulate through the cooler to eliminate air pockets and prevent cold fluid trapped in the cooler from shocking the system
  • Rebuildable
  • 6061-T6 billet aluminum construction with black MIL-A-8625 Type II anodized finish
  • Lightweight at just 7.5 ounces (212g) without brackets or fittings

Temperature Rating Specifications

Part Number Typ. Stabilization Temp Activation Temp Full Flow Temp
FSC-145 145ºF (63ºC) 140ºF (60ºC) 163ºF (73ºC)
FSC-165 165ºF (74ºC) 160ºF (71ºC) 181ºF (83ºC)
FSC-185 185ºF (85ºC) 180ºF (82ºC) 203ºF (95ºC)
FSM-205 205ºF (96ºC) 200ºF (93ºC) 221ºF (105ºC)
FSC-215 215ºF (102ºC) 212ºF (100ºC) 233ºF (112ºC)

Valve assembly is completely housed between the two ports.No valves, springs, or thermal motor interrupting the primary oil flow!

Ultra-compact dimensions (shown in inches)


Brackets allow for multiple mounting configurations



Available with 3/8" hose barb, 1/2" hose barb, or -6AN male fittings



  • Fluid cooling systems flowing up to a maximum of 5 GPM (18.93 LPM).
  • Fluid cooling systems for automotive and small vehicle transmissions, transaxles, transfer cases and differentials.
  • Oil cooling systems for small engines such as motorcycles, ATVs, go karts, snowmobiles, and small marine engines.
  • Not for use with corrosive fluids. If used with water, a distilled water solution with a lubricant such as ethylene glycol must be used.


  • 1x Compact remote thermostat block
  • 4x Black anodized 3/8" hose barb, 1/2" hose barb, or -6AN male adapter fittings with Viton O-rings (OPTIONAL)
  • 2x Zinc-plated steel mounting brackets and screws






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