Why a history check matters on a Audi A4
B9 A4 (2016+) shares the EA888 engine with VW Golf/Tiguan and the DSG dual-clutch with much of the VAG range — same fluid-service discipline applies. Verify MMI navigation has been updated (Audi stops releasing maps for cars >5 years old; an out-of-date MMI indicates lapsed service). Quattro variants need haldex-coupling fluid every 60,000km.