Hello! Since recently I have owned an Audi 80 b4 2.8 V6 Quattro . However, I have many (especially technical) questions about my new car ), 1.Does it make sense to allow the V6 Motor Super Plus? Does it bring more power or will the consumption be lowered somewhat? 2. Which engine oil is recommended? 3.What function does the DIF (Differential) switch have? When is it recommended to use the function? 4. Is it useful for the motor chip tuning? 5.What function does the Rec button have? i the climate switch to the right next to it? 6. Is the antenna electrically retractable? Have not found a way yet. 7. Is there anything else you should consider regarding the car, e.g. driving behavior, maintenance? MFG Silent_Soul