Which grade gearbox oil?

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

Duchams 75w90s always worked well for me

Quote:

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Originally Posted by RichyUK

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

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Quote:

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Originally Posted by michael tierney

Duchams 75w90s always worked well for me

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