BMW 3 Series vs Audi A4 2018: which German sedan holds up better on the used market

Experts have compared the reliability of two popular 2018 German sedans — BMW 3 Series and Audi A4. The conclusion is cautious: Audi looks slightly calmer for long-term ownership, but neither car can be called cheap or trouble-free on the used market.

The BMW 3 Series 2018 earns an average reliability score of 65 out of 100. Annual repair and maintenance costs come to roughly $773, or about €720. Common complaints include electronic glitches, engine issues and fuel system problems. For BMW that is hardly a surprise: people buy the 3 Series for the way it drives, not for low running costs.

The Audi A4 2018 takes a small lead. The front-wheel-drive version scores 3.5 out of 5, and average annual costs sit at around $739, or roughly €690. The all-wheel-drive A4 Quattro looks worse: thanks to a more complex driveline, costs climb to about $925 a year, or around €860. The main complaints concern the electrics, the MMI infotainment and quirks of the transmission.

Recall history tells a similar story. The 2018 BMW 3 Series had several recalls, including a serious one on the 328d diesel involving an EGR cooler with a fire risk. The 2018 Audi A4 had fewer recalls, mostly tied to safety systems and electrics — in particular the passenger seat occupancy sensor and heating elements.

At inspection, the BMW deserves a careful look at oil leaks, the turbo, cooling, the fuel system and the full service history. On the Audi the priorities are the gearbox, electrics, MMI, the all-wheel-drive system and the suspension. By 100–150 thousand kilometres both cars are ready to demand expensive work.

For a calmer ownership experience, the front-wheel-drive Audi A4 is the more rational pick. If the driving feel of a classic BMW 3 Series matters more, it is the more interesting choice — just budget for the maintenance in advance.