Audi S5 vs BMW 4 Series
Side-by-side reliability, price, and known-issue comparison for used-car buyers. Composite scores come from TÜV (Germany), ADAC (pan-European), NHTSA (US-sold variants), and DVSA MOT (UK inspections).
⭐ Better composite reliability
A
Audi S5
2016–2017
Reliability composite
92
/ 100
Excellent
MOT
Estimated used price
€17,500–€22,200Documented issues
0
B
BMW 4 Series
2015–2017
Reliability composite
79
/ 100
Good
ADAC + MOT + NHTSA
Estimated used price
€12,400–€21,100Documented issues
0
Bottom Line
The Audi S5 wins on composite reliability across TÜV, ADAC, NHTSA, and DVSA MOT data — typically a sign of lower ownership risk and fewer recurring failure modes at age. The other car isn't necessarily wrong; check its issue list and price-to-condition ratio before deciding.