Best Aftermarket Car Thermostat: Stant SuperStat Thermostat

Best Aftermarket Car Thermostat: Stant SuperStat Thermostat

Car Thermostats are key devices in systems that produce heat. As in the case of modern engines, they are used in regulating engine temperature by maintaining a constant degree or varying it over a specific range. They are also used in other systems that produce heat, including industrial furnaces. This article will do a comprehensive study of the features of the Stant 45359 SuperStat Thermostat based on our knowledge and experience and the experience of other users the best aftermarket thermostats. In the review, there will be an analysis of the features of the product and discussions on its pros and cons in details, as well as whether or not the pros outweigh the cons and if the product is worth its price.


  • Brand Stant
  • 4 ounces
  • 2 x 5.1 x 4.5 inches
  • China origin
  • Item model number 45359
  • Manufacturer Part Number 45359
  • OEM Part Number 45359


  • SuperStat exceeds OE performance
  • Contains larger piston and springs than OE thermostats
  • Better flow control than OE thermostats
  • Stainless steel flange for longer life and strength
  • A good choice when you want 195 Degrees Fahrenheit
  • Cheaper than automobile shop counterparts
  • Cost-effective


  • Might not work for levels above 195 Degrees Fahrenheit

General Information

The Stant SuperStat Thermostat is a very efficient car thermostat that out-performs the Original Equipment thermostat. Unlike the other thermostats that constantly need to open and close in order to achieve the proper operation temperature and flood the engine with coolant, the Stant SuperStat has a different mode of operation. It is designed to have a patented V-notch, non-linear design that works effectively to reduce cycling by precisely metering the amount of coolant needed. The V-notch design provides a small initial flow. As the engine heats up, these V-notches gradually open wider and releases the right amount of coolant needed into the system until the desired engine temperature is reached. This unique thermostat has so many benefits, including proper engine temperature control. This results in efficient engine operation, prolonged engine life, reduced oil consumption, improved fuel economy, and improved emissions.

The Stant SuperStat Thermostat has a high flow venture that is used for maximum cooling capacity during high temperature high load operation. It makes use of a patented Weir Valve, for precision flow metering during cold weather, light load operation, and to ensure that the temperature is stable under all conditions. The power element of the SuperStat is comparable to those used in the heavy-duty trucking industry. With its actuator piston that is 25% larger than a standard thermostat and 55% larger than competitive products, it has great advantages for the buyer. Buying this product affords the user this heavy piston duty that delivers one and a half times as much power as competitive stats for enhanced durability and longer life. The flange on the SuperStat Thermostat is 33% thicker than other standard products and 43% thicker than competitor’s thermostats for added strength and longer life. The operating spring is 50% stronger than standard thermostats. This unique feature helps return the Stant SuperStat to the closed position and prevents cold running even when the operating conditions are unfavorable.


The Stant SuperStat Thermostat is a definite recommendation for buyers who are looking for a cost-effective thermostat. It is efficient, durable, and long-lasting.

Thermostat Tech Tips

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About The Author


Auto Parts Guru is an automotive industry expert with over 30 years of experience as a technician, writer, and educator. Auto Parts Guru helped establish AutoPartsU and is a regular contributor to its Technical Advice articles.


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