The Mercedes-Benz CLS C218 occupies a unique place in the luxury automotive market. Introduced in 2010 as the second generation of the CLS nameplate, it blends the elegance of a four-door coupe with the comfort and refinement of a full-sized executive sedan. Positioned between the E-Class and S-Class in terms of prestige, the C218 was designed to appeal to drivers who wanted something more expressive than a traditional saloon without sacrificing daily usability.
With its sweeping roofline, wide stance, and available AMG variants, the CLS C218 continues to attract buyers looking for an attainable used luxury car in the US market. Engine choices ranged from efficient four-cylinder turbos to thunderous V8 biturbo units, giving prospective buyers a wide spectrum of performance and running costs to consider.
If you are shopping for a used CLS C218, understanding its reliability strengths and weaknesses is essential before committing to a purchase. This guide covers every major engine variant, known issues, maintenance costs, and what parts to budget for — everything you need to make a confident buying decision.
Parts & Accessories
Your Mercedes-Benz CLS C218 deserves better.
Hand-picked performance and replacement parts — ready to ship.
Shop Mercedes-Benz CLS C218 parts →History and Versions
The Mercedes-Benz CLS C218 was produced from 2010 to 2018, replacing the original CLS C219. It was built on the W212 E-Class platform, sharing much of its underpinning architecture with the contemporary E-Class W212. A facelift arrived in 2014, bringing revised headlights, updated infotainment, and revised engine mappings across the lineup.
The range included a broad selection of petrol and diesel engines, from the entry-level CLS 250 CDI to the flagship CLS 63 AMG S, with 4MATIC all-wheel drive available on select variants from 2012 onward.
| Engine | Displacement | Power | Torque | 0-60 mph | Notes |
|---|---|---|---|---|---|
| CLS 250 CDI (OM651) | 2.1L I4 Diesel | 204 hp | 369 lb-ft | 7.2 s | Most fuel-efficient variant |
| CLS 350 CDI (OM642) | 3.0L V6 Diesel | 265 hp | 457 lb-ft | 6.0 s | Best diesel balance |
| CLS 250 CGI (M271) | 1.8L I4 Turbo | 204 hp | 221 lb-ft | 7.3 s | Entry petrol, pre-facelift |
| CLS 350 CGI (M276) | 3.5L V6 | 306 hp | 273 lb-ft | 5.9 s | Widespread petrol choice |
| CLS 400 (M276) | 3.5L V6 Biturbo | 333 hp | 354 lb-ft | 5.2 s | Post-facelift only |
| CLS 500 (M278) | 4.7L V8 Biturbo | 408 hp | 443 lb-ft | 4.9 s | Premium petrol variant |
| CLS 63 AMG (M157) | 5.5L V8 Biturbo | 525 hp | 590 lb-ft | 4.1 s | AMG standard version |
| CLS 63 AMG S (M157) | 5.5L V8 Biturbo | 577 hp | 590 lb-ft | 3.9 s | Top-spec AMG, 4MATIC available |
How to Check a Used Mercedes-Benz CLS C218's History
Before buying a used Mercedes-Benz CLS C218, it is essential to ensure full transparency about its past. Undisclosed accidents can hide poor-quality repairs that directly compromise the safety of the driver and passengers.
The CLS C218 is a complex vehicle with an air suspension system, multiple electronic control modules, and intricate bodywork. Damage to any of these systems may not be visible at first glance. Misaligned bodywork panels, unreplaced side curtain airbags, hastily repaired front subframe components, or compromised air strut mounts are all risks that can appear normal during a casual inspection but lead to expensive failures or serious safety concerns down the road. It is therefore strongly recommended to check the vehicle's complete history using its license plate or VIN number before making any purchase decision.
Get an instant 20% discount to access a vehicle's full past with total transparency via carVertical by clicking this link or on the banner below:
Key Strengths
The CLS C218 offers a compelling package for used buyers who want premium build quality at a reduced price point.
The interior quality is genuinely excellent. Soft-touch materials, well-bolstered sport seats, and an available Burmester sound system place it comfortably in the upper tier of its segment. The W212-derived platform is well-proven, and many mechanical components are shared with the E-Class, which keeps parts availability high and costs relatively manageable for a vehicle of this prestige level.
The 7-speed 7G-Tronic Plus transmission fitted across most variants is smooth and durable when properly maintained. The diesel variants — particularly the CLS 350 CDI — offer a compelling combination of performance and real-world fuel economy, regularly achieving 35+ mpg on highway runs.
AMG variants deliver extraordinary performance and remain aspirational daily drivers. The CLS 63 AMG can feel genuinely supercar-quick while carrying four adults in comfort. For buyers who prioritize driving engagement, it remains one of the most rewarding executive cars of its era.
Known Reliability Issues
CLS 250 CDI — OM651
The OM651 2.1-liter four-cylinder diesel is a widely used engine but comes with specific vulnerabilities that every buyer must know about.
Timing chain wear/stretch is the most critical issue that can arise. This typically manifests between 60,000 and 100,000 miles and is considered Critical in severity. Always make sure manufacturer's oil change intervals have been respected.
Swirl flap failure is another known problem. The intake manifold swirl flaps can break apart and enter the engine, causing catastrophic damage. Severity: Critical. Typically appears from 80,000 miles onward. Replacement of the intake manifold assembly is the standard fix.
DPF (diesel particulate filter) clogging is common on vehicles used predominantly for short trips. Severity: Moderate. Appears from 50,000 miles and causes regeneration issues and power loss.
CLS 350 CDI — OM642
The OM642 V6 diesel is generally more robust than the OM651 but has its own documented weaknesses.
Inlet manifold swirl flap failure is shared with several Mercedes diesel engines. The plastic actuator arm and flap assembly can break, dropping debris into the engine. Severity: Critical. Typically appears at 80,000 to 120,000 miles.
Oil leaks from the valve cover and rear crankshaft seal are common on higher-mileage examples. Severity: Moderate. Usually appears beyond 90,000 miles.
EGR valve and cooler fouling leads to rough idling, reduced power, and increased smoke. Severity: Moderate. Common from 70,000 miles onward, especially in urban-use vehicles.
For a deeper understanding of this engine's reliability profile, see the Mercedes-Benz OM642 Engine Guide.
CLS 350 / CLS 400 — M276
The M276 V6 petrol engine is one of the better-regarded units in this generation but is not without issues.
Camshaft adjuster and timing chain tensioner wear is the primary concern. Rattling at cold start is the telltale symptom. Severity: Critical if ignored. Appears from 60,000 to 90,000 miles. Early intervention prevents catastrophic timing chain failure.
Oil consumption is reported on many M276 units, particularly in higher-mileage examples. Severity: Moderate. Check the oil level regularly and watch for blue smoke at startup.
Thermostat housing cracking is a minor but recurring issue, leading to coolant leaks. Severity: Minor. Typically appears from 50,000 miles.
CLS 500 — M278
The M278 4.7-liter V8 biturbo is a potent but maintenance-intensive unit.
Timing chain and tensioner wear is the most serious concern, shared with the M276 family. A rattling noise on cold start should be treated as urgent. Severity: Critical. Appears from 60,000 miles in poorly maintained examples.
Turbocharger oil feed line leaks are documented, particularly around the banjo bolt fittings. Severity: Moderate. Appears from 70,000 miles.
Coolant pipe and thermostat housing failures cause sudden coolant loss. Severity: Moderate. Inspect the entire cooling system carefully during any pre-purchase inspection.
CLS 63 AMG — M157
The M157 5.5-liter V8 biturbo is an exceptional performance engine that demands rigorous maintenance.
Valve train wear and camshaft lobe deterioration is associated with infrequent oil changes. Severity: Critical. Use only Mercedes-approved 0W-40 synthetic oil and change at no more than 7,500-mile intervals.
Turbocharger heat soak and wastegate rattle are reported on higher-mileage cars. Severity: Moderate. Typically from 80,000 miles onward.
Chassis Issues
Air suspension (Airmatic) failures are a significant concern across the entire C218 range. Compressor wear, torn air strut bladders, and valve block failures are common from 80,000 miles onward. Compressor replacement alone can cost $600 to $1,200. Always test all four corners before buying.
Front control arm bushings and ball joints wear progressively, causing vague steering and clunking over bumps. Severity: Moderate. Typical appearance at 60,000 to 80,000 miles.
Rear subframe rubber mounts deteriorate with age and mileage, contributing to handling imprecision. Severity: Minor to Moderate. Common on cars above 80,000 miles.
Electronics and Software
COMAND infotainment system freezes and GPS module failures are regularly reported. Severity: Minor. Appears across the model life, particularly on pre-facelift units.
Instrument cluster flickering and pixel loss is a known cosmetic and functional issue on earlier production cars. Severity: Minor.
Electronic parking brake actuator failure is a moderate concern, with the motor seizing over time. Severity: Moderate. Typically from 70,000 miles.
SAM (Signal Acquisition Module) corrosion can trigger multiple false fault codes and erratic behavior. Severity: Moderate to Critical depending on extent. Inspect the front SAM for moisture damage, especially on cars in salt-belt states.
Maintenance and Servicing
The CLS C218 follows Mercedes-Benz's ASSYST Plus service interval system, which adjusts service reminders based on actual driving conditions. However, many specialists recommend ignoring the maximum 15,000-mile oil change intervals and servicing every 7,500 miles or annually — whichever comes first.
Key service intervals and costs:
- Engine oil and filter change: Every 7,500 miles. Expect to pay $150 to $250 at an independent specialist, more at the dealer.
- Spark plugs (petrol engines): Every 30,000 miles. Budget $200 to $400 depending on the engine.
- Fuel filter (diesel engines): Every 40,000 miles. Around $100 to $200.
- Transmission fluid (7G-Tronic): Mercedes calls this a lifetime fill, but most specialists recommend changing it at 60,000 miles. Cost: $200 to $350.
- Air suspension compressor inspection: Every 60,000 miles or at any sign of sagging or slow leveling.
- Brake fluid: Every 2 years regardless of mileage.
Annual maintenance costs on a well-maintained C218 typically run $800 to $1,500 at an independent shop. AMG variants and air suspension repairs can push yearly costs significantly higher.
Parts to Watch / Replace First
Air suspension compressor: The most common failure point on the C218. Replace proactively if the existing unit is original and above 80,000 miles.
Air strut assemblies (front and rear): Bladders crack and develop leaks over time. Inspect all four before purchase and budget for replacement if the car sits unevenly.
Timing chain tensioner and guide rails (M276, M278, M157): Replace these preventively if there is no documented service history proving they have been inspected or changed. Critical for avoiding catastrophic engine damage.
Intake manifold with swirl flaps (OM651, OM642): Replace the entire assembly if cracks or broken actuators are found. Do not attempt to repair individual flaps.
Balance shaft module (OM651): Have this inspected by a specialist before purchasing any CLS 250 CDI. Replacement is expensive but far cheaper than an engine rebuild.
Control arm bushings and ball joints: Standard wear items that should be inspected at every service. Budget for full front axle refresh on any car over 70,000 miles.
Valve cover gasket and crankshaft seals: Common oil leak sources on higher-mileage examples across multiple engine types.
Electronic parking brake actuator: A recurring failure on older examples. Relatively affordable to replace but easy to overlook during pre-purchase checks.
FAQ
Is the Mercedes-Benz CLS C218 reliable?
The CLS C218 is moderately reliable for a luxury vehicle of its complexity, but it demands consistent and thorough maintenance. Neglected examples can become expensive very quickly, particularly due to air suspension failures and engine timing chain issues. A well-serviced car with documented history can be a dependable daily driver.
What is the best engine option in the CLS C218?
For a balance of performance, reliability, and running costs, the CLS 350 CDI with the OM642 V6 diesel is widely considered the best all-around choice. For petrol buyers, the CLS 350 with the M276 offers a good balance, provided timing chain maintenance is up to date. Avoid high-mileage examples without documented chain service.
How many miles will a Mercedes-Benz CLS C218 last?
A properly maintained CLS C218 can realistically last 200,000 miles or more. The diesel variants in particular are known for longevity when serviced correctly. AMG variants can achieve similar mileage but require more frequent and more expensive maintenance to get there.
Is the Mercedes-Benz CLS C218 expensive to maintain?
Yes, relative to non-luxury vehicles. Annual maintenance costs range from $800 to $1,500 at an independent specialist for standard variants. AMG models and cars with air suspension problems can easily exceed $2,500 to $4,000 in a bad year. Using a trusted independent Mercedes specialist rather than a main dealer significantly reduces costs.
What should I watch for when buying a used CLS C218?
Prioritize checking the Airmatic suspension for sagging or slow leveling, listen for timing chain rattle at cold start, inspect for oil leaks around the valve cover and rear crankshaft area, and verify that swirl flaps have been addressed on diesel models. Always obtain a full vehicle history report and have the car inspected by a Mercedes specialist before purchase.
Is the CLS 63 AMG worth buying used?
The CLS 63 AMG is an extraordinary car when properly maintained, but it is high-risk if the service history is incomplete. The M157 head bolt issue is a known critical failure point, and repair costs can be substantial. Only consider a CLS 63 AMG with a thorough and verifiable service record and a clean pre-purchase inspection from a qualified AMG specialist.
Conclusion
The Mercedes-Benz CLS C218 earns a reliability score of 6.5 out of 10. It is a beautifully engineered luxury coupe that rewards careful ownership and diligent maintenance, but it punishes neglect harshly. The best used examples are those with full service histories, documented timing chain work, and confirmed air suspension condition. Choose wisely, maintain proactively, and the CLS C218 can be one of the most rewarding used luxury cars on the market.
Browse our catalog for quality replacement parts and components for your Mercedes-Benz CLS C218.