Gear oil wrx sti 6 speed

[Turnerdv10]

They should tell everyone before you buy a wrx sti to expect big bills every week . 

Does anyone know what the best gear oil and brand to put in the wrx sti Hawkeye gearbox 6 speed to quieten it down . Sick of the whining especially if going down a hill in gear or low gears . It prob needs looking at but will have to wait till summer . Garage before me I think put 75/90 don’t know what brand. Been gradually getting worse . 

[Jay762]

75w/90 gives consistency over the biggest temperature range of the recommended types, not sure its going to stop the whine though

[Turnerdv10]

Ok no prob I’ll wait till it gets worse then  I’ll put a louder exhaust on lol