Sisu Polar is a truck model series produced by the Finnish heavy vehicle producer Sisu Auto. It came into the market in 2011 and the main applications are earthmovers, logging trucks, road maintenance vehicles, mobile cranes and heavy machinery hauliers which are fully equipped in the factory. The series includes two main variants DK12M and DK16M. The number of axles is 3, 4 or 5. Mercedes-Benz supplies some key components; cabins and engines in particular.