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Mercedes-Benz C 300 4MATICModel year report

2018 Mercedes-Benz C 300 4MATIC Problems

Complaints
12filed with NHTSA
Median mileage
54,000miles, 2 complaints with mileage
Recalls
3campaigns on record
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA crash rating
5 / 5stars overall, 2 rated versions
EPA fuel economy
25 mpgcombined, 2.0L 4-cyl 4WD · 22 city / 29 hwy

Sources: NHTSA records for the 2018 Mercedes-Benz C 300 4MATIC (complaints, recalls, investigations), NHTSA crash tests, EPA fuel economy. Report an error

NHTSA recorded 12 consumer complaints for the 2018 Mercedes-Benz C 300 4MATIC. The part named most often is other or unknown, with 4 complaints (33% of the total), followed by body and structure (4) and engine (2). 2 of the complaints include a mileage, and 50% of those were filed for vehicles with under 50,000 miles; the median is 54,000 miles. NHTSA lists 3 recall campaigns and 141 technical service bulletins for this model year. Other or unknown complaints overlap with 2 technical service bulletins filed under the same part. Body and structure complaints overlap with 9 technical service bulletins filed under the same part.

This model year has fewer than 25 complaints on record, so the numbers below can change a lot with a few new reports.

Which parts are reported most

Complaints can name more than one part, so the counts add up to more than the total. Select a part to see its complaints, recalls and bulletins.

Example complaints

Other or unknown: “2018 Mercedes C300 - a hole rusted through the rear subframe causing structural safety concerns. This car has been routinely washed weekly and the frame should not have rusted through within only 8 years. This also led to a large repair bill.”

NHTSA complaint #11752562, filed 2026-07

Body and structure: “****Please force Merces to recall all VIN's!******* NHTSA ID Number: 23V854000 1) Front glass roof panel came off while driving the car on the freeway. I didn't see or hear anything. When I got out of the car, I saw the entire piece has come off. This has caused my sunroof to malfunction, and it won't close now. I garage my car and barely drive it. I bought it used in Dec. 2021. There was about 46,000 on it in Dec 2021 and now (June 2026) the mileage is 51,000. Yes, the car is available for inspection. 2) I was on the freeway, didn't see it come off. No cars immediately in front or behind me. …”

NHTSA complaint #11743333, filed 2026-06

Engine: “2018 Mercedes C300. P052E check engine code. Positive Crankcase Ventilation failed with less than 28K miles. Common reported problem but not covered after warranty period, even with extended warranty addition. It's a major part of the engine function and 6 hours of labor to replace. Mercedes Benz should cover this type of fault on the design.”

NHTSA complaint #11503416, filed 2023-01

Air bags: “Apparently there is a recall situation that includes my vehicle and mercedes benz wasn't able to solve it yet. I bought the car after the recall has began.”

NHTSA complaint #11160885, filed 2018-12

Mileage when problems were reported

50% of the 2 complaints with a mileage were filed for vehicles with under 50,000 miles; the middle half falls between 49,000 and 59,000 miles.

0%0–100%10–2550%25–5050%50–750%75–1000%100–1500%150+
Share of complaints by mileage when the problem was reported, in thousands of miles (2 complaints with mileage). Red bars: under 50,000 miles. Bucket widths differ. Median: 54,000 miles.

Complaints by year filed

Fewer than 15 complaints, too few for a reliable trend.

2018202120232024202520266
Complaints by year the complaint was filed with NHTSA. Red bars: the last 3 full calendar years used for the trend. The current year (2026) is partial.

Crash test ratings

NHTSA's 5-Star Safety Ratings for the 2018 Mercedes-Benz C 300 4MATIC. Frontal results are shown driver / passenger; rollover shows the star rating and NHTSA's estimated risk of rolling over in a single-vehicle crash.

VersionOverallFrontalSideSide poleRollover
C-Class · sedan 4WD★★★★★5 / 4554 · 11.0% risk
C-Class · sedan RWD★★★★★5 / 4554 · 11.0% risk

Driver aids listed by NHTSA for the 2018 model year: forward collision warning optional, lane departure warning optional, automatic emergency braking not available.

Source: NHTSA New Car Assessment Program (5-Star Safety Ratings), nhtsa.gov/ratings.

Fuel economy and running cost

EPA ratings for each 2018 Mercedes-Benz C 300 4MATIC version. Annual fuel cost is the EPA's estimate at its current fuel prices for 15,000 miles a year (55% city driving).

VersionEngineTransmissionCityHwyComb.Fuel / yr
C300 4matic 4WD2.0L 4-cyl9-speed automatic233226$3,150
C300 4matic Convertible 4WD2.0L 4-cyl9-speed automatic222925$3,300
C300 4matic Coupe 4WD2.0L 4-cyl9-speed automatic223025$3,300

Source: U.S. EPA and Department of Energy, fueleconomy.gov. Ratings are for comparing vehicles; real-world mileage varies with driving and conditions.

Recalls and investigations

Recall details for the 2018 Mercedes-Benz C 300 4MATIC → · Check a VIN at nhtsa.gov/recalls

Technical service bulletins

TSBs are manufacturer notes to dealers about known repair procedures. They are not recalls and do not by themselves mean a vehicle has a fault. 141 on record; the latest 10 are shown.

See all 141 bulletins →

Other model years of the Mercedes-Benz C 300 4MATIC

YearComplaintsMedian miRecallsCrash ★MPGScore (50 = typical)Trend
20181254,0003525—Not enough data

All Mercedes-Benz C 300 4MATIC model years

Frequently asked questions

How many NHTSA complaints does the 2018 Mercedes-Benz C 300 4MATIC have?

NHTSA recorded 12 consumer complaints for the 2018 Mercedes-Benz C 300 4MATIC as of Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

What part of the 2018 Mercedes-Benz C 300 4MATIC is reported most often?

Other or unknown is named most often, in 4 complaints (33% of the total), followed by body and structure with 4.

Has the 2018 Mercedes-Benz C 300 4MATIC been recalled?

NHTSA lists 3 recall campaigns for this model year. To check a specific vehicle, enter its VIN at nhtsa.gov/recalls.

How did the 2018 Mercedes-Benz C 300 4MATIC do in NHTSA crash tests?

NHTSA's 5-Star Safety Ratings give the 2018 Mercedes-Benz C 300 4MATIC 5 out of 5 stars overall, across 2 rated versions (body style and drive). Ratings from different model years are only comparable when the vehicle was not redesigned in between.

What gas mileage does the 2018 Mercedes-Benz C 300 4MATIC get?

The EPA rates the 2018 Mercedes-Benz C 300 4MATIC (C300 4matic Convertible, 2.0L 4-cyl) at 25 mpg combined, 22 city and 29 highway, with an estimated annual fuel cost of $3,300 at 15,000 miles a year. Other engine and drive versions are rated differently.

At what mileage are problems with the 2018 Mercedes-Benz C 300 4MATIC reported?

Among the 2 complaints that include a mileage, the median is 54,000 miles and the middle half falls between 49,000 and 59,000 miles; 50% were filed for vehicles with under 50,000 miles.

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate. Crash ratings are from NHTSA’s New Car Assessment Program. Fuel economy is from the EPA and DOE (fueleconomy.gov).

Complaint counts come from NHTSA’s public complaint database; we count each complaint once. The source records for this vehicle are on nhtsa.gov. Scores and trends are our own summaries of that data, described in the methodology. This page is not legal, safety or repair advice: for a specific vehicle, check its VIN at nhtsa.gov/recalls and ask a qualified mechanic. See an error? Tell us.