<Table> <Tr> <Td> </Td> <Td> This section may need to be rewritten entirely to comply with Wikipedia's quality standards . You can help . The discussion page may contain suggestions . (January 2015) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This section may need to be rewritten entirely to comply with Wikipedia's quality standards . You can help . The discussion page may contain suggestions . (January 2015) </Td> </Tr> <P> In the worldwide oil industry, an oil barrel is defined as 42 US gallons, which is about 7002159000000000000 ♠ 159 litres or 35 imperial gallons . In Canada, oil companies measure oil in cubic metres but convert to barrels on export, since most of Canada's oil production is exported to the US . The nominal conversion factor is 1 cubic metre = 6.2898 oil barrels, but conversion is generally done by custody transfer meters on the border since the exact conversion factor depends on oil density and temperature . </P> <P> Oil companies that are listed on American stock exchanges typically report their production in terms of volume and use the units of bbl, Mbbl (one thousand barrels), or MMbbl (one million barrels) and occasionally for widest comprehensive statistics the Gbbl (or sometimes Gbl) denoting a billion . There is a conflict concerning the units for oil barrels (see § Definitions and units). For all other physical quantities, according to the International System of Units, the uppercase letter "M" means Mega ("one million"), for example: Mm (one million metres, megametres), MHz (one million hertz, or megahertz), MW (one million watts, or megawatt), MeV (one million electronvolt, or megaelectronvolt). But due to tradition, the Mbbl acronym is used today meaning "one thousand bbl", as a heritage of the roman number "M" meaning "one thousand". On the other hand, there are efforts to avoid this ambiguity, and most of the barrel dealers today prefer to use bbl, instead of Mbbl, mbbl, MMbbl or mmbbl . </P>

How many liters is in a barrel of oil