Hello, wouldn’t it be useful with a car, both the first kilometers to drive completely without cooling, so that the motor comes faster to operating temperature, and then to activate the water boiler circuit later ?? Ok there is a large and a small cooling circuit, is certainly a good approach, but a modern car still needs at least 10 km until it is operating warm. That is for many short-distance cars too long and they never get really warm. Specifically my problem, with the Golf 4 1.6 SR (8V) in winter it never gets really warm, so in the oil fill a yellow mud collects!