[320touring]

Gearbox oil is the Transmission oil. if only half remains-check for leaks. Before that, confirm whether the level should be checked cold or hot, and running or off. the levels can vary a lot-meaning false readings if not checked under the correct conditons

an autobox uses differing fluid pressure to select different gears- the routing of the fluid determines the gear.

Your setup is like a conventional auto box- the torque converter acts like a clutch and flywheel in one. The "Chronic" bit means you have some control over what gear the box is in.

As you already know, Audi have built in some parameters to stop you "lugging" the engine- it may be worth researching if you can "teach" the gearbox so that they are set closer to YOUR driving style. (I know that the e60 5 series can be reset and learn-not too sure on the VAG side)

May be worth a scout of the fora for any reset procedures. I'd also look for info re whether the box needs the fluid flow for cooling (if so, no P&G for you)