good morning everyone, new to these forums and omega's so a few quick questions if you don't mind.
First of all, just underneath the indicator stalk there's another stalk that I've only just noticed and haven't got the first idea what it's for!
Secondly, the previous owner changed the battery and didn't have the code for the radio, so anyideas how to get it working again? will it be a dealer jobby?sadly there isn't a handbook and I've checked all the paperwork but alas no code

thirdly, it's done around 78400 miles and i'm not sure if the cam belt has been changed so would it be worth changing and roughly how much should I expect to pay?
fourthly, the sat nav cd that came with is is well out of date, 1998 it says on the case iirc so how much will a new one set me back and will it work with the current system? it's all factory standard and no upgrades.
fith, what type of engine oil does it need?
I think that's all for now and thanks for reading!