Trying to decide if I should put a new thermostat in, with how cold it has been the last week the temp gauge usually sits at 70C. All my driving is on open country roads at 80km/h just cruising and the only time it will go over 70 is if I go up some hills. I know a diesel with low loads doesn't generate much heat so I am debating is it a thermostat opening too early or I am simply not burning enough fuel
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