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FSX-185 Flow-Series Extreme -16AN Engine Oil Cooler Thermostat, 185-degrees F
InfoVehicle Info Needed
IMPROVED RACINGPART NUMBER: 553-FSX-185

FSX-185 Flow-Series Extreme -16AN Engine Oil Cooler Thermostat, 185-degrees F

$39900
ShippingShips on 11/13/2026
Lowest PriceLowest Price Guarantee

Flow-Series Extreme -16AN Engine Oil Cooler Thermostat
  • 185-degrees F

    Improved Racing FSX-185 Features:

    • Designed for large diesel engine and transmission applications flowing up to 33 GPM (125 LPM) of oil and up to 50 GPM (189 LPM) of water
    • Patented high-flow design with no valves, springs, or other obstructions in the primary oil flow
    • Maintains a minimum fluid temperature of 185-degrees F in most conditions
    • Features -16AN female O-ring boss ports
    • Optional adapter fittings available in various sizes

      • Completely Rebuild Your Thermostat

      Improved Racing thermostat rebuild kits equip you to modify the temperature rating or repair their FSC, FSM, and FSX-Series inline thermostats.

    Part TypeOil Cooler Thermostat
    Product LineImproved Racing Thermostat Rebuild Kits
    BrandIMPROVED RACING
    Package Height4.25
    Package Width4.25
    Package Length8.75
    Weight2.18 PG
    Part CategoryPerformance Parts
    Vendor Part NumberFSX-185
    Package Qty1
    Package TypeEA
    Some parts are not legal for use in California or other states with similar laws / regulations
    p65 warning