For winter, yes you did the right thing. Actually you just put a stock rated aftermarket thermostat in there. You should have just gotten a factory thermo if you wanted to run the stock rating.
It matters because your coolant temperature sensor (the one the ECU uses) needs to see higher than 170 degree for the engine to go into closed loop. That's when the engine operates at its most efficent, completely combusting the fuel mixture, burning off condensation, reducing emmissions, etc.
Last edited by IHateHacks; 02-28-2007 at 03:07 PM.
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