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#1
02-03-2000, 07:51 PM
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During the winter, my 420 SEL's coolant temperature gauge doesn't go higher than 60 degrees centigrade, while in the summer it runs at 80 degrees - and gets better gas mileage by two or three MPG. Shouldn't the thermostat keep the engine at the same optimum temperature year round for efficient combustion, give or take a few degrees for days when it is extremely hot or cold?
JoeB 
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