What to Know About the 2014 Mercedes CLS 350 Before Buying

If you're researching a used 2014 Mercedes CLS 350, you're likely looking for a luxury coupe sedan that blends style, performance, and comfort. This model year falls within the second generation (C218) of the CLS-Class, which was praised for its sleek fastback design, premium cabin, and strong V6 powertrain. The 2014 CLS 350 typically came with a 3.5L naturally aspirated V6 engine producing 302 horsepower, rear-wheel drive (or optional 4MATIC), and a 7-speed automatic transmission. While it offers a refined driving experience, potential buyers should be aware of known reliability concerns, maintenance costs, and key differences between trim levels before making a purchase decision.

Understanding the 2014 Mercedes CLS 350 Model Line

The 2014 Mercedes-Benz CLS-Class represents the midpoint of the C218 generation, which spanned from 2011 to 2018. During this time, the CLS evolved from a bold design experiment into a well-established luxury grand tourer. The CLS 350 was positioned as the entry-level gasoline-powered model in most markets, sitting below the more powerful CLS 550 (V8) and high-performance AMG variants like the CLS 63 AMG.

In 2014, the CLS 350 was available in several body styles and configurations:

• CLS 350 Sedan (C218): The standard four-door coupe with a sloping roofline
• CLS 350 BlueEFFICIENCY: A fuel-optimized version with minor aerodynamic tweaks and efficiency-focused tuning
• Optional 4MATIC All-Wheel Drive: Available for improved traction in adverse weather conditions
• AMG Sport Package: Added aggressive styling cues, sport suspension, and upgraded wheels

While some later models shifted to turbocharged four-cylinder engines, the 2014 CLS 350 retained the larger 3.5L V6, which many enthusiasts prefer for its smooth power delivery and linear throttle response compared to forced-induction alternatives.

Engine and Performance: What You Can Expect

The heart of the 2014 Mercedes CLS 350 is its 3.5-liter M276 V6 engine, which produces 302 hp at 6,500 rpm and 273 lb-ft of torque at 3,500–5,250 rpm. This engine was shared across several Mercedes models of the era, including the E350 and ML350, giving it a solid track record.

⚙️ Power is sent through a 7G-TRONIC PLUS 7-speed automatic transmission, known for smooth shifts and responsive kick-downs when accelerating. In real-world driving, the CLS 350 can accelerate from 0–60 mph in approximately 6.4 seconds with rear-wheel drive, or around 6.9 seconds with 4MATIC.

Despite weighing over 4,000 lbs, the car feels composed and agile thanks to precise steering and a well-tuned suspension. It’s not a sports sedan like the BMW M5, but it excels as a comfortable cruiser with enough power for confident passing and highway merging.

Specification	2014 Mercedes CLS 350
Engine	3.5L V6 (M276 DE35)
Horsepower	302 hp @ 6,500 rpm
Torque	273 lb-ft @ 3,500–5,250 rpm
Transmission	7-speed automatic (7G-TRONIC PLUS)
Drive Type	RWD (4MATIC optional)
0–60 mph	6.4 sec (RWD), 6.9 sec (4MATIC)
Fuel Economy (EPA est.)	19 mpg city / 28 mpg highway
Curb Weight	~4,100 lbs

Fuel Efficiency and Real-World Driving Experience

The EPA estimates the 2014 CLS 350 at 19 mpg city and 28 mpg highway, with a combined rating of about 22 mpg. These figures were competitive for a luxury V6 sedan at the time, especially considering the vehicle's weight and aerodynamic profile.

⚡ In practice, drivers report averages between 20–24 mpg depending on driving style and conditions. Highway cruising is where the CLS shines—its long gearing and low wind resistance help maintain efficiency at sustained speeds. However, aggressive acceleration or stop-and-go traffic will quickly reduce fuel economy due to the engine’s displacement and the car’s mass.

Unlike later models that adopted turbocharging and mild-hybrid systems, the 2014 CLS 350 relies purely on internal combustion, meaning no regenerative braking or start-stop system complications. Some owners appreciate this mechanical simplicity, even if it comes at a slight fuel cost.

Interior Quality and Technology Features

✨ One of the standout aspects of the 2014 CLS 350 is its interior. Mercedes-Benz used high-quality materials throughout, including genuine wood trim, soft-touch plastics, and optional leather upholstery. The front seats are supportive and offer multiple adjustments, including lumbar support and heating (optional).

The dashboard layout centers around a large analog gauge cluster and a central COMAND display screen (about 7 inches). While not as advanced as modern infotainment systems, it supports:

• Bluetooth phone and audio streaming
• Navigation (with optional voice control)
• USB and auxiliary input
• HD Radio and satellite radio compatibility
• Multi-view backup camera (optional)

However, users often note that the COMAND interface can feel slow and unintuitive by today’s standards, relying heavily on a rotary knob rather than touch input. Apple CarPlay and Android Auto were not available in 2014, so smartphone integration is limited to basic connectivity.

Common Mechanical Issues and Reliability Concerns

🔧 Like many German luxury vehicles of this era, the 2014 CLS 350 offers an excellent driving experience but comes with potential ownership costs. While the M276 V6 engine is generally reliable, several components have known failure points:

1. Air Suspension Failures (if equipped)

Some CLS 350 models came with AIRMATIC air suspension, which provides adaptive damping and ride height adjustment. Over time, air struts and compressors can fail, leading to sagging corners or warning messages. Replacement costs range from $800–$1,500 per corner, making this one of the most expensive maintenance items.

2. Oil Leaks from Valve Cover Gaskets

The M276 engine is prone to valve cover gasket leaks, especially after 80,000 miles. These leaks can drip oil onto exhaust manifolds, causing smoke and burning smells. Repair cost: ~$400–$700 depending on labor rates.

3. Transmission Mount Degradation

The rubber mounts that isolate the 7G-TRONIC transmission can degrade over time, leading to clunking noises during gear changes. Replacing them improves refinement and is relatively affordable (~$300–$500).

4. Electronic Gremlins

Owners occasionally report issues with sensors, window regulators, or climate control modules. These are often isolated but can be frustrating due to diagnostic complexity.

✅ According to reliability databases, the 2014 CLS 350 has a moderate repair frequency, with higher-than-average costs once issues arise. Annual maintenance should budget for fluid changes, brake service, and inspection of suspension components.

Maintenance Schedule and Ownership Costs

📋 Keeping a 2014 CLS 350 in good condition requires adherence to a regular maintenance schedule. Key services include:

• Every 10,000 miles: Oil and filter change, tire rotation
• Every 20,000 miles: Cabin air filter, inspection of belts/hoses
• Every 40,000 miles: Spark plugs, brake fluid flush
• Every 60,000 miles: Transmission fluid service, coolant replacement
• Every 80,000–100,000 miles: Air suspension evaluation, fuel injector cleaning

📍 Labor rates at independent shops typically range from $120–$180/hour, while dealerships may charge more. Using OEM parts ensures compatibility but increases cost. Aftermarket alternatives exist for filters, brakes, and suspension components, though quality varies.

Average annual maintenance cost: $800–$1,500, depending on age, mileage, and prior service history.

Safety Ratings and Driver Assistance Systems

The 2014 CLS 350 did not undergo full U.S. government crash testing by the NHTSA or IIHS, which was common for low-volume luxury models at the time. However, it includes a robust suite of safety features for its class:

• Seven airbags (front, side, knee, curtain)
• Electronic Stability Program (ESP)
• BAS Plus (Brake Assist System)
• ATTENTION ASSIST (drowsiness detection)
• Blind Spot Assist (optional)
• Lane Keeping Assist (optional)
• Adaptive Highbeam Assist (optional)

These systems enhance active safety, particularly on long drives. However, they are less advanced than current-generation driver aids and lack full automated emergency braking capabilities found in newer cars.

How the 2014 CLS 350 Compares to Rivals

When shopping for a used luxury coupe sedan, buyers often consider alternatives. Here’s how the 2014 CLS 350 stacks up against key competitors:

Model	Engine	HP	0–60 mph	Fuel Economy
2014 Mercedes CLS 350	3.5L V6	302	6.4 sec	19/28 mpg
2014 BMW 535i	3.0L Turbo I6	300	5.9 sec	20/29 mpg
2014 Audi A7 3.0T	3.0L Supercharged V6	310	5.3 sec	18/28 mpg
2014 Lexus GS 350	3.5L V6	306	6.1 sec	19/28 mpg

While the CLS 350 matches rivals in power, it lags slightly in acceleration due to its heavier curb weight and older naturally aspirated engine. However, its design remains one of the most distinctive in the segment, with frameless doors and a sweeping roofline that still turn heads today.

Buying Tips: What to Look for in a Used 2014 CLS 350

🛒 Purchasing a used 2014 CLS 350 requires careful inspection. Here are critical steps to avoid costly surprises:

1. Verify Service History: Full records show whether major services (transmission fluid, spark plugs, coolant) were completed on time.
2. Inspect for Oil Leaks: Check under the hood and beneath the engine for signs of valve cover or camshaft seal leaks.
3. Test Air Suspension: If equipped, cycle through ride height settings and listen for compressor noise or uneven leveling.
4. Scan for Error Codes: Use an OBD2 scanner to check for stored codes related to transmission, suspension, or electronics.
5. Evaluate Interior Wear: Leather surfaces, steering wheel, and gear selector should show minimal cracking or excessive wear.
6. Check Tires and Brakes: Uneven wear may indicate alignment or suspension issues.

Consider a pre-purchase inspection by a qualified Mercedes specialist, ideally one familiar with the C218 platform. This can uncover hidden problems and provide peace of mind.

Is the 2014 CLS 350 Right for You?

The 2014 Mercedes CLS 350 is ideal for buyers who value:

• Distinctive, timeless coupe-sedan styling
• A smooth, powerful V6 engine without turbo lag
• A luxurious, quiet cabin for long-distance comfort

It may not be the best choice if you prioritize:

• Low maintenance costs or high reliability
• Modern tech like smartphone projection or digital dashboards
• Maximum fuel efficiency or electric powertrains

Compared to newer models, the 2014 CLS 350 lacks the latest safety tech and infotainment features but offers a purer analog driving experience favored by some enthusiasts.

Frequently Asked Questions

Below are common questions from buyers researching the 2014 Mercedes CLS 350:

What kind of gas does the 2014 CLS 350 require?

The 2014 Mercedes CLS 350 requires premium unleaded gasoline with an octane rating of 91 or higher. Using lower-octane fuel may result in reduced performance and potential engine knocking over time.

Does the 2014 CLS 350 have Bluetooth?

Yes, the 2014 CLS 350 comes with Bluetooth connectivity for hands-free calling and audio streaming. Pairing is done through the COMAND system using the central controller.

How reliable is the 2014 Mercedes CLS 350?

The 2014 CLS 350 has mixed reliability. The engine is durable, but air suspension, electronic modules, and aging seals can lead to costly repairs. Regular maintenance and pre-purchase inspections are crucial.

What is the typical price range for a used 2014 CLS 350?

As of 2024, well-maintained examples typically sell between $18,000 and $26,000 USD, depending on mileage, condition, trim level, and location.

Can the 2014 CLS 350 tow anything?

The 2014 CLS 350 is not designed for towing. Mercedes does not publish a towing capacity for this model, and doing so could damage the drivetrain or suspension.