Porsche Classic Motor Oil - 20W-50 The Porsche Classic 20W-50 is a mineral oil known as a hydrocracked base oil with mildly alloyed additives. Hydrocracked base oils are characterized by a very low level of contaminants, a very low sulphur content and very good oxidation and ageing stability, which prevents deposits, for example. At the same time, the Porsche Classic Motor Oil 20W-50 has an extremely high HTHS viscosity (High Temperature, High Shear), which describes the quality of th