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a residue of crude oil refining processes. The product remaining after the lighter fractions - gasoline, kerosene, lubricating oils, wax, and distillate fuels - have been extracted from the crude; residual fuel oil.
raskas polttoöljy . EKI terminibaas Esterm. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//esterm/raskas%20poltto%C3%B6ljy/1/fin (20.06.2026)
