auto gearbox oil

So i got notified in my car that the A3 service is coming up and i filled out the online form on my Mercedes Benz dealer’s website. A guy called me and told me that this service includes the normal changing of liquids but also the air filter, spark plugs and gearbox oil. That in my opinion seems...

Occasionally when the engine has run some distance, smoke erupts unexpectedly from the bonnet and front passenger side. I suspect it's caused by over gauged oil from the auto gear box dropping on the hot exhaust at high speed. The side opening of the gear box was once opened by a mechanic who...

Again I am sorry for starting another thread if it's not needed, I have searched and read topics without clear answers for over two hours again and I'm tired of fruitless searches, so I have decided to start this thread, but by all means delete it if you think it's unnecessary or in the wrong...