Audi DSG DQ250 Gearbox Service Kit. 6 LTR LIQUI MOLY DCTF 8100 & Mann Oil Filter. Our Audi DSG Gearbox service kit has been created especially for the Audi DSG (DQ250) 6 speed semi-automatic gearbox found in many Audi models including the Audi A1, Audi A3, Audi Q2, Audi TT, TTS and TT RS.