Which grade gearbox oil? [Archive]

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RichyUK

12-03-2020, 16:33

Hi Guys,

Whats the correct grade and type of gearbox oil? Haynes manual says 75w90s which i assumed to be synthetic. Ajays said Comma list it being 75w80 mineral oil.

I got semi synthetic 75w90 for the box (after changing driveshafts) and now the box feels horrible and struggling for gears. Maybe it should be mineral after all?

Can anyone confirm?

Cheers

michael tierney

13-03-2020, 13:24

Duchams 75w90s always worked well for me

Hi Guys,

Whats the correct grade and type of gearbox oil? Haynes manual says 75w90s which i assumed to be synthetic. Ajays said Comma list it being 75w80 mineral oil.

I got semi synthetic 75w90 for the box (after changing driveshafts) and now the box feels horrible and struggling for gears. Maybe it should be mineral after all?

Can anyone confirm?

Cheers

RichyUK

13-03-2020, 16:31

Duchams 75w90s always worked well for me

cheers, i went with the Comma Ep75w80 and the box feels perfect now :)