Which oil for 131 sport gearbox?

[chris131]

Hi all, I'm looking to know what type of oil should go into a 131 sport gearbox?

Thanks
chris

[mirafiori76]

Chris,

15W90 was what they used in the 70's and 80's.

[Thotos]

We've discussed this in the past a few times so you might want to do a search and see what's been said.  The gist of it is that Fiat claim it should be a non-EP gear oil. Fiat's version is the Tutela ZC90 oil and it should still be available from most Fiat garages or people like Ricambio (have a look at http://www.ricambio.co.uk/index.php?route=product/product&keyword=zc90&product_id=453). Because non-EP gear oils were not widely available in the UK, Fiat UK recommended using engine oil in their gearboxes. You can use a straight 30W engine oil (a 30W engine oil has the same viscosity as a 90 gear oil) or use a multigrade engine oil like 20-40 (I would avoid the very thin 0-40 modern engine oils).  A lot of people have used 90EP gear oil in their gearboxes for years and have not had problems but why take the risk.

[Thotos]

you might want to do a search and see what's been said. 

I did  (a search that is) so have a look at http://www.131mirafiori.com/smf/index.php?topic=1922.msg12531#msg12531