In essence, engine oils can be divided into three types: synthetic, semi-synthetic (synthetic-based) and mineral. Synthetic motor oils are obtained by refining base oils and appropriate additives, but can also be completely synthesized in a laboratory. They are intended for modern high-performance engines. Semi-synthetic motor oils are a mixture of synthetic and mineral oil, with the addition of appropriate additives. They are most often used for vehicles of modern construction that have exceeded a certain mileage and/or are 10 years or older. Mineral motor oils are produced by refining crude oil, with the addition of special additives and are mainly used for older types of engines, engines without turbochargers and some working machines. The viscosity of an engine oil can be most simply described as the “flowability” of the oil under certain conditions; that is, it indicates the level of fluidity of the lubricant and its efficiency at low and high temperatures. Modern engine oils are of the multigrade type and mostly bear the designation 00W-00. The lower the first number, the more efficient the product at low temperatures. The second, higher number indicates the resistance of the oil film at high operating temperatures. For more information, visit the Advice & Proposals section.