Yes you can use 0W oil. The number before the W (which is for winter) represents the oil viscosity/flow at low temperatures. So the lower the W number the better the oil's cold temperature/cold start performance. As for the second number, that refers to the viscosity at 100C, therefore the lower the number the thinner the oil (so a W10 is thinner that a W 30). Manufacturers normally recommend the best grade of oil for their engines