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2018 BMW 4 Series Convertible
Solid pick. The public record on this car is clean for its age. Inspect it, then negotiate with confidence.
34 owner complaints · 0 recalls · data verified July 14, 2026 · source: NHTSA
Why buy?
Engine problems dominate (29% of complaints).
Very few owner complaints for its age and sales volume.
Zero recalls, rare for a car this age.
The math, shown
Full methodology →Complaints filed per year
Fading = early teething worked out. Climbing = problems aging in.
How it crashes
NHTSA’s own crash tests, separate from the reliability score above.
NHTSA crash-tested this model year but didn’t publish an overall star rating for it.
Source: nhtsa.gov/ratings. Star ratings compare vehicles within the same class and size, not across every car on the road.
The road ahead
What breaks on a 2018 BMW 4 Series Convertible, plotted where owners report it happening.
Also reported (mileage varies): Engine (10) · Engine & cooling (7) · Electrical system (6)
Mileage medians come from owners who mentioned an odometer reading in their NHTSA complaint, a rough guide, not a schedule.
Engine
29%10 complaints · 2 in the last 2 years
“I pulled out onto Southside Blvd. My brakes failed, my driver’s front of the car hit a Waste Management garbage truck right back tire and cut the sidewall of the tire.…”
Engine & cooling
21%7 complaints · 4 in the last 2 years
“The contact owns a 2018 BMW 430I. The contact stated while driving at an undisclosed speed, the engine started overheating with the low coolant warning light illuminat…”
Electrical system
18%6 complaints · 2 in the last 2 years
“I pulled out onto Southside Blvd. My brakes failed, my driver’s front of the car hit a Waste Management garbage truck right back tire and cut the sidewall of the tire.…”
Seat belts
12%4 complaints · 1 in the last 2 years
“Seatbelt alert pops up and noise sounds even when seatbelt is already buckled”
Recalls (0)
No recall campaigns on file for this model year.
Before you hand over money
Check the VIN for open recalls
NHTSA’s free lookup shows whether this exact car had its recall remedies completed.
Free NHTSA VIN check ↗Get a pre-purchase inspection
A $150 to $250 independent inspection of this exact 2018 BMW 4 SERIES CONVERTIBLE beats every score on the internet, including ours.
What to ask forNot set on the 2018? See how every 4 Series Convertible model year scores →
Cross-shopping? Compare the 2018 BMW 4 Series Convertible against another car →
What owners say
Real owners of this exact model-year, shown separately from the NHTSA score. If they disagree, that’s worth knowing.