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Re: temp drop
I do not think your oil change has anything to do with it. The cooling system basically works like this: Once the internal temp of the car reaches a certain degree, the thermostat opens and allows the radiator fluid to pass through the upper radiator hose to be cooled by passing in front of the radiator. Travelling down the road would keep airflow and keep the engine cooler. Some people use an "old trick", never tried it, by putting a piece of cardboard in front of the radiator to restrict the cold air flow.
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