Home · 2018 · Mercedes-benz
2018 Mercedes-benz S-class Phev
Solid pick. The public record on this car is clean for its age. Inspect it, then negotiate with confidence.
29 owner complaints · 0 recalls · data verified July 21, 2026 · source: NHTSA
Why buy?
Very few owner complaints for its age and sales volume.
Zero recalls, rare for a car this age.
Score breakdown, by factor
Full methodology →#76 of 456Among the 2018 models with a matured record, the 2018 Mercedes-benz S-class Phev ranks #76, scoring higher than 81% of them. See the 2018 ranking →
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.
1 open NHTSA defect investigation on file for this model year, separate from the recalls above.
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 Mercedes-benz S-class Phev, plotted where owners report it happening.
Also reported (mileage varies): Engine (7) · Steering (5) · Brakes (5)
Mileage medians come from owners who mentioned an odometer reading in their NHTSA complaint, a rough guide, not a schedule.
Engine
24%7 complaints · 3 in the last 2 years
“Excessive engine oil lead from the back seal. Also, slow coolant leak. The car has a low mileage of 46k.”
Steering
17%5 complaints · 2 in the last 2 years
“Steering wheel became extremely stiff to turn and a message that read “steering malfunction increase physical effort” appeared while driving at around 30 mph while in …”
Brakes
17%5 complaints · 1 in the last 2 years
“The contact owns a 2018 Mercedes-Benz S450. The contact stated while driving at an undisclosed speed, the contact attempted to depress the brake; however, the vehicle …”
Suspension
10%3 complaints · 1 in the last 2 years
“Vehicle Check Engine Light turned on a Vehicle Lost power. Vehicle often hesitates upon acceleration. Convertible Top does not close as well intermittently.”
Check it against this car’s mileage
Type the odometer reading on the actual car you’re looking at to see which of these problem areas owners tend to report before it, around it, or after it.
Too few owners named a mileage on this model to place issues against an odometer yet.
Read all 29 owner complaints in their own words → · just the 3 crash/fire/injury reports →
Recalls (0)
No recall campaigns on file for this model year.
Questions to ask the seller
Questions worth asking the seller of this Mercedes-benz before you buy, drawn from its public record:
- Owners of this model report engine problems more than anything else. Has this car shown any engine symptoms, and are there repair records for it?
- Owners of this model report steering problems more than anything else. Has this car shown any steering symptoms, and are there repair records for it?
- Has this car been in any accident or had any structural, airbag, or flood-related repair? Do you have a clean title and a recent history report (Carfax / AutoCheck)?
- How many owners has it had, do you have the maintenance records, and why are you selling it?
- Are you open to me having an independent mechanic inspect it before we settle on a price?
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 Mercedes-benz S-CLASS PHEV beats every score on the internet, including ours.
What to ask forNot set on the 2018? See how every S-class Phev model year scores →
Cross-shopping? Compare the 2018 Mercedes-benz S-class Phev 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.