if thermostat is stuckwhat would it cause the motor to do if it overheating real bad. considering beforehand I put just a little bit of marvel oil it
Stuck OPEN or stuck CLOSED? If it's open, engine will take long time to reach operating temperature, engine ECU may stay in "open loop" mode much longer. If CLOSED, you get no coolant flow and overheating, which can lead to engine failure, Marvel Mystery Oil or not. It takes 5 minutes to swap out the thermostat, not worth the risk.
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