The main global unit of measurement for oil volume is the American oil barrel (abbreviated Bbl), equal to 42 gallons or 158.988 liters. Therefore, the price for global oil brands, which are benchmarks, is set in US dollars $USDC per barrel. $BTC For the simplification of trading operations, benchmark or marker grades of oil are used. This is due to the diversity of oil components (sulfur content, alkane group content, presence of impurities, etc.) depending on the field. The standard for global prices is the WTI oil (also known as Texas Light Sweet) and Brent, with WTI mainly used for the Western Hemisphere (and as a reference for other oil grades in general), while Brent is primarily for the markets of Europe and OPEC countries. For Russian oil, the marker grade is Urals, which is created by mixing various types of oil extracted there in the pipeline system. $ETH