Audi S3 vs Mercedes-Benz C-Class
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 S3
2015–2017
Reliability composite
87
/ 100
Excellent
MOT + NHTSA
Estimated used price
€12,500–€17,200Documented issues
0
M
Mercedes-Benz C-Class
2015–2017
Reliability composite
68
/ 100
Average
ADAC + MOT + NHTSA
Estimated used price
€11,700–€26,600Documented issues
2
• Thrust arm bushings wear (front suspension) — €400
• COMAND infotainment boot loop — €600
Bottom Line
The Audi S3 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.