used car Posted November 19, 2015 Share Posted November 19, 2015 I have a 1987 subaru gl 1.8 liter engine 4w4 I am replacing thermostat. What temperture thermostat do i need to use. Quote Link to comment Share on other sites More sharing options...
DaveT Posted November 19, 2015 Share Posted November 19, 2015 Oem from a dealer, or one of the highest grade Stant brand only. Stock is around 190 degrees. I have Stant ones in my cars now. One at standard temp, one at 180. There is a noticeable lowering of the heater output. But the cooler temp might be easier on seals and the like. Being diligent about monitoring coolant is important to avoid bigger repairs. Quote Link to comment Share on other sites More sharing options...
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