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Review on πŸ”§ Improved Motorcraft RT1139 Thermostat for Enhanced Engine Performance by Mike Larkin

Revainrating 5 out of 5

Made in the USA for FoMoCo

Yes, it costs 3x more than other aftermarket thermostats. But you get what you paid for. This thermostat serves its purpose while keeping my EEC 4 happy. (Always use a 192 degree thermostat for EEC 4 units or your car/truck will run rich and possibly fail the emissions test and recycle the fuel. You will also get more heat from the heater)

Pros
  • Excellent Overall Performance
Cons
  • Doubtful