Hello everyone,
I'm new here and in the world of cars.
I want to change the gearbox oil and want to know two things exactly: Type of oil and quantity?
This way I'll know what to buy and how much to buy.
Thnx in advance.

Read the manual or search online. Everything's there, no need to ask someone to dig it up for you.

You might find the compatible oils from Champion or Wolf brands. They may be available in your country. Check their website. Surely there's Mobil1, Shell, Total. It's not that mysterious. If in doubt , you'd better take it to a garage or quick oil change places. No need to keep guessing any longer.

Thanks for the reply eeeno
Before posting here I've searched and found only contradictory info. I searched again for manuals and found out some info.
My car:
2008 Fiat Grande Punto (199) 1.3 Multijet (90 Hp) Dualogic
Gearbox oil:
Type: Synthetic-based gear oil SAE 75W-85. Exceeds API GL-4 specifications.
Recommend brand: Tutela car matryx
The problem is, I still can't find anywhere the quantity needed!
If someone could be so kind to tell me I'd appreciate it.

Be very very careful.
The oil in the dualogic system that changes gear for you - it is not gear oil.