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Mercedes-Benz · Coupé · 2002–2010

Mercedes-Benz CLK C209 Coupé

Weaknesses, engine ratings and buying advice

1.4 / 5.0 · Based on 9 engine variants
Most Fun Engine

457–525 PS

6.2L V8 AMG Benzin

CLK 63 AMG — V8 Coupé of the Old School

Legendary!
Problem Engine

457–525 PS

6.2L V8 AMG Benzin

10 weaknesses

Stay Away!

Engine Overview

The Mercedes-Benz CLK C209 Coupé is available with 13 engine variants — from 120 to 525 hp.

CLK 220 CDI · Diesel· 150 PS
2005 2010
Stay Away! 6 weaknesses
CLK 270 CDI · Diesel· 163–170 PS
2002 2005
Stay Away! 6 weaknesses
CLK 320 CDI · Diesel· 224 PS
2005 2010
Stay Away! 7 weaknesses
CLK 200 CGI · Benziner· 163–170 PS Engine Change
2003 2005
Stay Away! 6 weaknesses
2003 2005
Stay Away! 6 weaknesses
CLK 200 Kompressor · Benziner· 163–184 PS Engine Change
2002 2006
Stay Away! 6 weaknesses
2002 2006
Stay Away! 6 weaknesses
2006 2010
Stay Away! 6 weaknesses
CLK 240 · Benziner· 163–170 PS
2002 2005
Be Careful 7 weaknesses
CLK 280 · Benziner· 231 PS
2005 2010
Stay Away! 6 weaknesses
CLK 320 · Benziner· 218 PS
2002 2005
Be Careful 7 weaknesses
CLK 350 · Benziner· 272 PS
2005 2010
Stay Away! 6 weaknesses
CLK 500 · Benziner· 306–387 PS Engine Change
2002 2006
Be Careful 10 weaknesses
2006 2010
Stay Away! 9 weaknesses
CLK 55 AMG · Benziner· 367 PS
2002 2006
Be Careful 10 weaknesses
CLK 63 AMG · Benziner· 481 PS
2006 2010
Stay Away! 10 weaknesses
CLK 63 AMG Black Series · Benziner· 507 PS
2007 2009
Stay Away! 10 weaknesses

Vehicle Weaknesses

WeaknessCost
5G-Tronic: Coolant Ingress via Valeo Cooler

Valeo transmission oil heat exchanger on pre-facelift models up to 09/2003 develops leaks. Coolant enters the transmission and destroys the clutch packs. Symptom: humming and juddering at low revs.

Symptoms: Humming and juddering under light acceleration at low rpm, cloudy transmission fluid
from 70,000 km
High

Frequently Asked Questions

What problems and weaknesses does the Mercedes-Benz CLK C209 Coupé have? +
The Mercedes-Benz CLK C209 as Coupé has 72 known weaknesses, 5 vehicle-related.
Which engine is recommended? +
Be Careful: M112 (3.2L V6), M113 (4.3-5.4L V8). No engine is rated 'Good Choice'.
Is the Mercedes-Benz CLK C209 Coupé worth buying used? +
Caution is advised with the Mercedes-Benz CLK C209 Coupé — 7 of 9 engine variants are rated 'Stay Away!'.

Last updated: February 2026 · All information without guarantee

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