BMW 6 Series vs Porsche 911
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).
B
BMW 6 Series
2015–2017
Reliability composite
88
/ 100
Excellent
MOT + NHTSA
Estimated used price
€23,200–€35,300Documented issues
0
⭐ Better composite reliability
P
Porsche 911
2015–2017
Reliability composite
99
/ 100
Excellent
MOT + NHTSA
Estimated used price
€25,700–€71,100Documented issues
0
Bottom Line
The Porsche 911 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.