VXOC Astra-J/GTC

Can anyone tell me the specs of gear oil for the 1.3 DTE engine?

Rusty will know hopefully but sure its all the same regardless of what engine you have one oil for all Astra j gear box

I ask because i don't want to use the genuine from opel but another product.

I'd have look but a quick glance at the Haynes says the following.

Manual Transmission Vauxhall / Opel gear oil (93 165 694)

Automatic Transmission
1.6L Petrol engine models Vauxhall / Opel automatic transmission fluid (93 165 414)
2.0L Diesel engine models Vauxhall / Opel automatic transmission fluid (93 165 147)

I know the Vauxhall / Opel stuff is meant to be lifetime.

A couple of questions if I may...

1. How about 1.4L turbo Petrol engine?
2. Do you have a recommended product?
3. How often do you change gear oil? If at all...
4. Do you add gear oil? If at all..

I actually had to rebuild my gearbox recently (87,000km).
So I'd like to know as much as I can.

Thanks a lot in advance,