Porsch: If your vehicle is used frequently in stop-and-go traffic in cold weather, the engine will not always be properly warmed up. Condensation from products of combustion may accumulate in the oil. In this case,it is advisable to change the oil more frequently so that your engine once again has 100% efficient engine oil.
關於黏度的部份Porsch也提到: The viscosity of the engine oil for your Porsche has to be chosen according to the ambient temperature given in the engine oil recommendation table.