Comparison · Reliability Ranked

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–€22,200
Documented issues
0
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B

BMW 4 Series

2015–2017
Reliability composite
79
/ 100
Good
ADAC + MOT + NHTSA
Estimated used price
€12,400–€21,100
Documented issues
0
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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.

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Audi S5 reliability
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BMW 4 Series reliability