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#BS-2018-MERC30-4E4F

2018 Mercedes-Benz C300Problems, Recalls & Reliability

Based on reports from 130 owners and 18 recalls for this exact model.

Data updated ·checked October 30, 2026 · NHTSA complaints through October 28, 2026

Complaints
130
Crashes
9
Fires
0
Recalls
18
TSBs
188
🟡

Preliminary Verdict

Think Twice

Based on 130 complaints, 9 crashes, 0 fires, and 18 recalls. Complaint rate is 3.4x the class average.

See full verdict with buy/skip conditions

Top reported problems

1

thermostat engine light

1 complaints • Severity 4/10

$X,XXX
2

no symptoms just engine light for oil pressure sensor

1 complaints • Severity 8/10

$X,XXX
3

gas tank and canister replacement

1 complaints • Severity 10/10

$X,XXX
4

panoramic sunroof

1 complaints • Severity 2/10

$X,XXX
5

the tires are splitting on their own

1 complaints • Severity 6/10

$X,XXX

Preview: What's in your full report

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Mechanic Inspection Checklist

!Check the EngineHIGH

34 owners reported engine issues — failures commonly reported around 52K miles.

!Inspect the SteeringMED
Look for symptoms of wear and premature failure
+ 6 more items in full checklistUnlock

Failure Timeline by Mileage

11
0–30K
9
30–60K
9
60–90K
1
90–120K
120–150K
150K+

Peak failure range: 0–30K miles (11 reports) • Median: 52K miles

Full report: which components fail at each mileageUnlock

30,000-Mile Cost Projection

Best Case

$X,XXX

Most Likely

$X,XXX

Worst Case

$X,XXX

Top cost driver: Engine (34 reports).

Includes fuel costs, common repairs, and recall riskUnlock

Also in your report

Owner Intelligence

AI-synthesized themes from real complaints

Buyer Lot Checklist

Questions, test drive checks, walk-away triggers

Negotiation Talking Points

Data-backed dollar deductions

Buy / Skip Verdict

Final recommendation with conditions

10 sections total in the full reportUnlock all

Where the complaints fall

Engine34 (26%)
Other20 (15%)
Steering11 (8%)
Electrical10 (8%)
Fuel System10 (8%)
Structure:body8 (6%)
Structure6 (5%)
Airbags4 (3%)

2018 Mercedes-Benz C300: Known Issues & Problem Areas

Engine Issues

Engine complaints account for 26% of all reports filed for the 2018 Mercedes-Benz C300, with 34 owners filing complaints with NHTSA. The median mileage at time of complaint is 52,300 miles, suggesting issues tend to surface around the 52K-mile mark.

Steering Issues

Steering complaints account for 8% of all reports filed for the 2018 Mercedes-Benz C300, with 11 owners filing complaints with NHTSA. Owners should pay attention to steering-related symptoms during test drives and pre-purchase inspections.

Electrical Issues

Electrical complaints account for 8% of all reports filed for the 2018 Mercedes-Benz C300, with 10 owners filing complaints with NHTSA. Owners should pay attention to electrical-related symptoms during test drives and pre-purchase inspections.

Fuel System Issues

Fuel System complaints account for 8% of all reports filed for the 2018 Mercedes-Benz C300, with 10 owners filing complaints with NHTSA. Owners should pay attention to fuel system-related symptoms during test drives and pre-purchase inspections.

Data sourced from NHTSA owner complaints and community reports. The full report analyzes severity, repair costs, and failure patterns for each category.

Complaint trend by year

6
18
19
19
1
20
10
21
18
22
33
23
28
24
10
25
5
26

Complaints filed with NHTSA by year for the 2018 Mercedes-Benz C300. Recent trend: decreasing.

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Repair costs • Negotiation scripts • Mechanic checklist • Buy/skip verdict

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Recall History (18 recalls)

17V627000Dec 2017

AIR BAGS:FRONTAL

Mercedes-Benz USA, LLC. (MBUSA) is recalling these vehicles: 2014-2018 CLA250, CLA250 4Matic, CLA45 AMG 4Matic, 2015-2018 GLA250, GLA250 4Matic, GLA45 AMG 4Matic, C300 4Matic, C63S AMG, 2012-2014 C250, C350, C300 4Matic, E550 4Matic, 2013-2014 C63 AMG, 2012-2015 C250 Coupe, C350 Coupe, C63 AMG Coupe, 2013-2015 C350 4Matic Coupe, GLK250 4Matic BlueTec, GLK350, GLK350 4Matic, 2016-2017 C350e, C43 AMG, 2015 C400 4Matic, 2016-2018 C63 AMG, GLC300, GLC300 4Matic, 2017-2018 C300 Coupe, C300 4Matic Coupe, C43 AMG, C63 AMG Coupe, C63S AMG Coupe, C300 Cabriolet, C300 4Matic Cabriolet, C43 AMG Cabriolet, C63 AMG Cabriolet, C63S AMG Cabriolet, GLC300 4Matic Coupe, GLC43 AMG, GLC43 AMG Coupe, 2014 E350 Coupe, E350 4Matic Coupe, E350 Cabriolet, E400 Hybrid, 2015-2017 E400 Coupe, E400 4Matic Coupe, E400 Cabriolet, 2014-2017 E550 Coupe, E550 Cabriolet, B250e, 2014-2016 E250 BlueTec, E63 AMG 4Matic Wagon, 2012-2013 E350 BlueTec, 2012-2016 E350, E350 4Matic, 2015-2016 E400, E400 4Matic, 2012 E63 AMG, 2014-2015 E250 4Matic BlueTec, 2013-2016 E350 Wagon, 2017 GLC300d 4Matic, and 2018 GLC350e 4Matic. The driver's air bag may unexpectedly deploy due to insufficient grounding of the steering components if an electrostatic discharge occurs and the air bag clockspring is broken.

18V207000Jun 2018

SEATS

Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2017-2018 C43 AMG 4Matic Coupe, C300 Coupe, C300 4Matic Coupe, C300 4Matic Cabriolet, C300 Cabriolet, C43 AMG 4Matic Cabriolet and C63S AMG Cabriolet, 2017 C63 AMG Cabriolet, C63S AMG Coupe and C63 AMG Coupe, 2018 E400 Coupe and E400 4Matic Coupe vehicles. The seatbacks of the front seats may not properly lock on the right side of the seat.

18V456000Sep 2018

STRUCTURE:BODY

Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2017-2018 Mercedes C300 Cabriolet, C300 4Matic Cabriolet, C43 AMG Cabriolet, C63S AMG Cabriolet, and C63 AMG Cabriolet vehicles. Due to a bonding issue introduced in the production process, the rear beltline trim may separate from the vehicle.

18V608000Nov 2018

VISIBILITY:GLASS, SIDE/REAR

Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2018 Mercedes-Benz C300, C300 4MATIC, C63 AMG, and C63S AMG vehicles. Incorrect bonding of the rear window may cause the window to loosen and detach from the vehicle.

18V725000Nov 2018

ELECTRICAL SYSTEM:12V/24V/48V BATTERY:CABLES

Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2018 Mercedes-Benz C300 4Matic Coupe, C300 4Matic Cabrio, E300, E300 4Matic, C300, C300 4Matic, C300 Coupe and C300 Cabrio vehicles. The cover for the starter battery may not cover the live positive electrical wire, and in certain crashes, the vehicle's strut brace may deform and short circuit the battery.

+ 13 more recalls in the full report

Recall severity analysis & seller scripts

The full report rates each recall's severity and gives you scripts for asking the seller about recall completion.

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NHTSA Defect Investigations (2)

1 investigation still open: NHTSA is examining whether a defect warrants a recall.

EA21002OpenOpened Sep 2021

Desiccated Air Bag Inflator Rupture

AIR BAGS:FRONTAL:DRIVER SIDE:INFLATOR MODULE

PE21001ClosedOpened Jan 2021 · closed Oct 2021

Front Roof Panel Detachment

STRUCTURE:BODY:ROOF AND PILLARS

The worst model year for the Mercedes-Benz C300 is the 2016 — worth knowing if you're cross-shopping years. The biggest problem area is engine.

2018 Mercedes-Benz C300 vs. Class Average (Compact Cars)

This vehicle

130

Class avg

39

3.4x the class average — significantly more complaints than typical compact cars vehicles.

Complaint counts correlate with sales volume — popular vehicles naturally generate more reports. The full report normalizes for this.

About this data

NHTSA Complaints

Federal database of owner-filed safety complaints. 130 records for this vehicle.

NHTSA Recalls

Manufacturer-issued safety recalls. 18 recalls found for this vehicle.

Repair Cost Data

Real-world repair costs from owner reports and independent databases.

Last updated (checked October 30, 2026). NHTSA complaints received through October 28, 2026.

Other Mercedes-Benz C300 Model Years

2026202520242023202220212020201920182017201620152014201320122011201020092008
View all Mercedes-Benz C300 years →

2018 Mercedes-Benz C300: Frequently Asked Questions

What is the most common problem with the 2018 Mercedes-Benz C300?
The most commonly reported issue with the 2018 Mercedes-Benz C300 is related to the engine, with 34 complaints filed with NHTSA.
Is the 2018 Mercedes-Benz C300 reliable?
The 2018 Mercedes-Benz C300 has 130 complaints, 9 crash reports, and 0 fire reports filed with NHTSA. This is 3.4x the class average — higher than typical for its segment.
How much does it cost to fix 2018 Mercedes-Benz C300 problems?
Repair costs vary by issue. The full BumperScan report includes detailed repair cost estimates (low/median/high) for every major issue, plus a 30,000-mile total cost of ownership projection.
Does the 2018 Mercedes-Benz C300 have any recalls?
Yes, the 2018 Mercedes-Benz C300 has 18 recalls on record. The full report includes recall severity analysis and scripts for asking the seller about recall completion.
What mileage do Mercedes-Benz C300 problems start?
Based on 30 complaints with mileage data, the median mileage at time of complaint is 52,300 miles. The highest concentration of reported issues occurs in the 0–30K mile range. The full report breaks down exactly which components fail at each mileage bracket.
When was the 2018 Mercedes-Benz C300 data last updated?
BumperScan last checked this vehicle against NHTSA on October 30, 2026, covering owner complaints received through October 28, 2026 plus the latest recalls, investigations and technical service bulletins. Its numbers last changed on October 13, 2026.
What’s in the full report?
10 sections of AI analysis: severity-ranked issues, component scores (0-100), 30K-mile cost projection, failure timeline by mileage, recall details with seller scripts, owner sentiment analysis, mechanic checklist, buyer lot checklist, negotiation ammo with dollar figures, and a buy/skip verdict.
How is this different from free NHTSA data?
NHTSA gives you raw complaint text. BumperScan cross-references 2.1M+ complaints with community repair cost data, EPA fuel data, and recall records — then uses AI to synthesize it into actionable advice with dollar figures.
How is this different from Carfax?
Carfax is VIN-specific history ($45/report). BumperScan is model-level reliability intelligence — what problems this car is known for, what they cost, and whether you should buy it. Complementary, not competing.
What if the report isn’t useful?
100% money-back guarantee. If the report doesn’t help you make a more informed decision, we’ll refund you — no questions asked.
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10 sections of AI analysis based on 130 owner reports. Know before you buy.

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