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Line 41: ==Classifications or grades== Generally speaking, oil with an API gravity between 40 and 45° commands the highest prices. Above 45°, the molecular chains become shorter and less valuable to refineries.<ref>{{cite web\|title=Comments on Crude Oil Gravity Adjustments \|url=http://dnr.louisiana.gov/sec/execdiv/techasmt/oil_gas/crude_oil_gravity/comments_1989.htm \|archive-url=https://web.archive.org/web/20060502160519/http://dnr.louisiana.gov~~:80~~/sec/execdiv/techasmt/oil_gas/crude_oil_gravity/comments_1989.htm \|dead-url=yes \|archive-date=2 May 2006 \|publisher=Louisiana Department of Natural Resources \|accessdate=6 January 2014 }}</ref> [[Crude oil]] is classified as light, medium, or heavy according to its measured API gravity.

API gravity: Difference between revisions