By the colour of the exhaust smoke it is possible to determine what’s wrong with your car:

• The engine smoke is blue. The possible reasons include wear of the cylinder-piston group, valves, valve guides, valve stem seals, sticking of piston rings due to carbonization, worn bearings of turbine supports or seals in turbine engines, absence of spark in one of the cylinders due to malfunction of the electric circuit.
• The engine smoke is white. Possible reasons include moisture in the engine and exhaust system, improper functioning of the cooling system. Light smoking by cold start, especially in winter, is considered completely normal. If the smoke continues even after being warmed up to the operating temperature, it is necessary to take the car to a service station.
• The engine smoke is black. The exhaust smoke of the engine can be black due to improper functioning of the fuel system. In this case it is necessary to take the car to a service station.