What engines were available in the W205 C-Class?

The W205 C-Class was available with the following engines: M274 2.0L I4 Turbo (C300), M276 3.0L V6 Biturbo (C400/C450), M177 4.0L V8 Biturbo (C63/C63 S AMG), OM651 2.1L CDI I4 (C220d/C250d).

sedan · 2015–2021

W205

Q: What are the most common problems with the Mercedes-Benz W205 C-Class?

M274 timing chain tensioner defect (2015-2017 production) (Severity: high). 9G-Tronic rough shifting and delayed gear engagement (Severity: medium). Rear suspension air spring leaks on Airmatic-equipped models (Severity: medium). Engine mount premature failure causing excessive vibration (Severity: medium). Thermostat housing leak on M274 engine (Severity: low)

Q: How reliable is the Mercedes-Benz W205 C-Class?

The W205 C-Class (2015–2021) has a reliability rating of "good" based on Beach Benz's 35 years of service experience. The W205 is a refined, well-built car. We see the M274 timing chain issue mostly in 2015-2016 production -- Mercedes issued a service campaign but not all cars were addressed. We check this during every service visit.

Q: What is the maintenance schedule for the W205 C-Class?

Engine oil & filter (M274 turbo): Every 10,000 miles. 9G-Tronic fluid service: Every 40,000 miles. Spark plugs: Every 45,000 miles. Brake fluid flush: Every 2 years / 20,000 miles

C-Class

Reliability: Good

4 engines5 known issues

Overview

The W205 C-Class was a generational leap, incorporating aluminum-intensive construction, Airmatic suspension options, and an interior design heavily inspired by the S-Class. It relied exclusively on turbocharged four-cylinder and V6 biturbo engines for non-AMG models. The C63 AMG switched to the M177 4.0L V8 biturbo, a hand-built powerplant shared with the AMG GT.

Engines & Transmissions

Engine Options

M274 2.0L I4 Turbo (C300)
M276 3.0L V6 Biturbo (C400/C450)
M177 4.0L V8 Biturbo (C63/C63 S AMG)
OM651 2.1L CDI I4 (C220d/C250d)

Transmissions

9G-Tronic (725.0)
722.9 MCT (AMG Speedshift)

Common Problems

Known issues reported across the W205 production run, ordered by severity. These are based on our direct experience servicing these vehicles over 35 years.

M274 timing chain tensioner defect (2015-2017 production)

High severity

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9G-Tronic rough shifting and delayed gear engagement

Medium severity

→

Rear suspension air spring leaks on Airmatic-equipped models

Medium severity

→

Engine mount premature failure causing excessive vibration

Medium severity

→

Thermostat housing leak on M274 engine

Low severity

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Maintenance Highlights

Key service intervals for the W205. These are based on our recommended schedule for Southern California driving conditions, which may differ from factory-specified intervals.

Engine oil & filter (M274 turbo)

Every 10,000 miles

9G-Tronic fluid service

Every 40,000 miles

Spark plugs

Every 45,000 miles

Brake fluid flush

Every 2 years / 20,000 miles

Reliability Assessment

Good Reliability

Based on 35 years of service data at Beach Benz

PoorFairGoodExcellent

Beach Benz Experience

From Our Technicians

“The W205 is a refined, well-built car. We see the M274 timing chain issue mostly in 2015-2016 production -- Mercedes issued a service campaign but not all cars were addressed. We check this during every service visit.”

— Beach Benz service team · 35+ years of Mercedes-Benz specialization

W205 Specialist

Your W205 deserves a specialist.

Factory diagnostics. OEM parts. 35 years of Mercedes-Benz expertise. Whether it's a routine service or a complex repair, Beach Benz has your W205 C-Class covered.

Call (714) 842-9816 Call (714) 842-9816