Abstract: The disclosure relates to an oil circulation system for a gas turbine engine, and in particular to a gas turbine engine comprising a bearing chamber with a plurality of oil injectors. Example embodiments include a gas turbine engine, comprising: a bearing chamber (301) surrounding a turbine shaft (308) of the engine; an oil feed injection line (305) arranged to supply oil from an oil collecting compartment to a plurality of oil injectors (306, 401, 402) within the bearing chamber (301); an oil exit pipe (309, 313) arranged to allow oil to exit the bearing chamber (301); and an oil supply pump arranged to recirculate oil from the oil collecting compartment to the oil feed injection line (305), wherein the plurality of oil injectors comprise an injector (401, 402) arranged to direct oil towards an inlet of the oil exit pipe (309, 313).