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:O When comes so low temperature, engine in all vechicles runnning 24h/day ? In Poland, when its just five degrees, buses go all the time with short stops for check oil :P
Usually there are no problems with starting engine even when there is -30, that's why drivers usually stop engine during long stops. Certified vehicle must start when there is -25, it is certificational condition.
Each vehicle, sold/produced in Russia, should be tested by experts at the special track in Dmitrov (Автополигон НИЦИАМТ), and to get a special paper - ОТТС, Одобрение Типа Транспортного Средства. Without it it couldn't be registered and mustn't ride on the roads. Such limit works only for new vehicles, and one of its conditions - a "cold start" in freeze camera.
>So are there any maintainance problems connected with frost?
Of course, there are. One of it is seen on this picture More attention during such freezes is paid to heaters, fuel and lubricants. And all busparks have special eqiupment for "easy start" after the night parking.