Carlsson Mercedes-Benz CLK (1998) Review & Specs

Introduction

The Carlsson Mercedes-Benz CLK (1998) represents one of the earliest comprehensive tuning interpretations of the W208-generation CLK, modified by the German tuning specialist Carlsson Autotechnik. Founded in 1989 by brothers Rolf and Andreas Hartge in Merzig, Germany, Carlsson has specialised exclusively in Mercedes-Benz vehicles since its inception, building a reputation for high-performance engine upgrades, elegant alloy wheel designs, and complete vehicle conversions.

For the W208 CLK, Carlsson offered a range of tuning packages spanning the entire engine line-up. The most accessible was the CK20 kit for the CLK 200 Kompressor, which increased the supercharged 2.0-litre four-cylinder's output from 192 PS to 195 PS using a mechanical pulley and air filter upgrade. For the CLK 320, Carlsson offered a supercharger conversion producing approximately 300 PS, while the CLK 430 could be transformed into the CM50 K with a 5.0-litre supercharged V8 producing 430 PS, or the ultra-exclusive CM60 RS with a 6.0-litre naturally aspirated V8 producing 405 PS. Buyers considering a Carlsson-modified W208 should understand that the 1998 model year falls within the early production period, and that Carlsson offered its components both as complete packages and as individual items. Verifying the authenticity and completeness of any Carlsson conversion is therefore essential before purchase.

Exterior Design and Dimensions

The Carlsson CLK is built on the W208 platform, which Mercedes-Benz introduced in 1997 as a two-door grand tourer based on the W202 C-Class platform. The W208 was designed by Michael Fink and Peter Pfeiffer under the direction of Bruno Sacco, and was available as a coupé (C208) from April 1997 and as a convertible (A208) from May 1998. The W208 measures 4,567 mm in length, 1,722 mm in width, and 1,371–1,382 mm in height, with a wheelbase of 2,690 mm.

Carlsson's exterior modifications for the W208 include a comprehensive body kit comprising a front bumper, rear bumper, and side skirts. The most dramatic package was the CM60 RS body kit, developed for the 2001 Paris Motor Show, which featured a front airdam with integrated brake cooling ducts and a rear spoiler. The vehicle rides on Carlsson alloy wheels, with the 1/5 and 2/5 designs in 18-inch dimensions being popular fitments for the W208. Recommended fitments include 8.5 x 18-inch at the front with 225/40 ZR18 tyres and 10 x 18-inch at the rear with 255/35 ZR18 or 265/35 ZR18 tyres. The Carlsson sport suspension lowers the body by approximately 30 mm, reducing the centre of gravity and improving handling characteristics.

Interior, Comfort, and Practicality

The interior of the Carlsson CLK starts with the W208 cabin and is enhanced by Carlsson with high-quality materials. Carlsson offered a range of interior appointments including leather and Alcantara upholstery, carbon fibre trim, and an ergonomically designed sports steering wheel. The most dramatic transformation was applied to the CM60 RS, which in its Paris show car configuration had the rear seats removed to make room for an integrated roll cage, with bucket seats and special upholstery transforming the interior into something approaching a luxury competition car. A preserved example received a more refined treatment with handcrafted light brown leather upholstery, Alcantara on the headlining and door panels, and carbon fibre details on the steering wheel and centre console.

The W208 CLK is a four-seat grand tourer with a driver-oriented dashboard and reasonable space for four adults. The boot offers approximately 420 litres of luggage capacity, with the rear seat backrest folding down to accommodate larger items. Practical limitations are typical of a two-door coupé: rear headroom is restricted by the sloping roofline, and access to the rear seats requires folding the front seats forward. Carlsson's interior modifications do not significantly alter the vehicle's practicality, though the bucket seats and roll bar in the CM60 RS reduce rear-seat access and comfort.

Technology, Ownership, and Maintenance

Ownership of a Carlsson-modified CLK requires attention to both the standard W208 maintenance schedule and the specific requirements of the Carlsson components. Routine servicing for the W208 includes oil and filter changes at recommended intervals, with spark plugs and air filters replaced at longer intervals. The 1998 model year CLK was available with several engine options: the CLK 200 with a 2.0-litre four-cylinder producing 136 PS, the CLK 200 Kompressor with a supercharged 2.0-litre four-cylinder producing 192 PS, the CLK 230 Kompressor with a supercharged 2.3-litre four-cylinder producing 193 PS, and the CLK 320 with a 3.2-litre V6 producing 218 PS. The CLK 430 with its 4.3-litre V8 producing 279 PS joined the range later.

Carlsson-specific components demand particular attention. The CK20 kit for the CLK 200 Kompressor consists of a special water pump wheel, a special vibration damper, a Carlsson air filter, and a Carlsson chrome badge. It is a purely mechanical upgrade with no electronic component, making it simple to install and maintain. The CK32 supercharger conversion for the CLK 320 is a more complex installation that adds a supercharger system to the 3.2-litre V6. The CM50 K and CM60 RS conversions for the CLK 430 involve extensive engine modifications including displacement increases and supercharger or internal component changes.

Parts availability for the base W208 CLK is generally good through Mercedes-Benz dealerships and independent specialists. Carlsson-specific parts, however, may be difficult to source, particularly the aerodynamic components, forged wheels, and engine components for the V8 conversions. Prospective buyers should confirm that any required Carlsson parts are available or that suitable alternatives exist. Documented mechanical concerns for the W208 include rust issues, particularly on pre-facelift models, and general electronic complexity typical of Mercedes-Benz vehicles of this era. The 722.6 five-speed automatic transmission, fitted to many W208 models, is generally robust but requires regular fluid changes. The biodegradable engine wiring harness insulation on early V6 and V8 models can deteriorate and cause misfires and rough running.

Carlsson Mercedes-Benz CLK (1998) Specifications and Performance

Carlsson offered multiple performance packages for the W208 CLK, each based on a different engine. The CK20 kit for the CLK 200 Kompressor increases output from 192 PS (141 kW) at 5,500 rpm to 195 PS (144 kW) at 5,500 rpm, with torque rising from 270 Nm to 280 Nm between 3,000 and 4,000 rpm. This is a modest but meaningful increase achieved through mechanical changes only. Carlsson quotes a 0–100 km/h time of approximately 6.7 seconds for the CK20-equipped SLK 200 Kompressor, and similar performance improvements would apply to the CLK.

The CK32 supercharger conversion for the CLK 320 raises the 3.2-litre V6's output to approximately 300 PS, a substantial increase over the standard 218 PS. The CM50 K package, based on the CLK 430 and its 4.3-litre V8, adds a supercharger system developed with Ogura Clutch, producing 430 PS (316 kW) and 650 Nm of torque, with a 0–100 km/h time of 5.1 seconds and a top speed of over 280 km/h. The CM60 RS, the most exclusive conversion, increases the V8's displacement to 6.0 litres, producing 405 PS and over 600 Nm of torque, with a 0–100 km/h time of approximately 5.0–5.2 seconds and a top speed of 290 km/h. Only two examples of the CM60 RS were produced.

Specifications Table

Specification	Carlsson CK20 (CLK 200 Kompressor, 1998)
Make and model	Carlsson Mercedes-Benz CLK (CK20, based on CLK 200 Kompressor W208)
Model year	1998
Generation	W208 (first-generation CLK, C208/A208)
Body style	Two-door coupé or convertible
Engine	2.0-litre four-cylinder supercharged, M 111.944
Engine displacement	1,998 cc
Maximum power (Carlsson CK20)	195 PS (144 kW) at 5,500 rpm
Maximum torque (Carlsson CK20)	280 Nm at 3,000–4,000 rpm
Standard CLK 200 Kompressor power (for reference)	192 PS (141 kW)
Transmission	Five-speed automatic or six-speed manual
Drivetrain	Rear-wheel drive
Length	4,567 mm
Width	1,722 mm
Height	1,371–1,382 mm
Wheelbase	2,690 mm
Kerb weight (CLK 200 Kompressor reference)	Approximately 1,375–1,425 kg

City Driving and Highway Use

The Carlsson CLK is a mid-size grand tourer with dimensions that make it reasonably suited to urban environments. At approximately 4.57 metres in length, it is manageable in city conditions, and the elevated seating position relative to the car's low overall height provides reasonable visibility. The 30 mm suspension lowering reduces ground clearance, and drivers should exercise care with speed humps and steep driveways.

In city traffic, the automatic transmission provides smooth, unobtrusive shifts, and the torque-rich supercharged four-cylinder allows the car to move easily at low speeds. For the CK20-equipped CLK 200 Kompressor, the increased torque of 280 Nm gives noticeably stronger low-speed response than the standard 270 Nm, making overtaking and merging easier. Fuel consumption in urban conditions will be higher than the official combined figure, but the CLK's relatively light weight contributes to reasonable economy for a vehicle of its class.

On the highway, the Carlsson CLK comes into its own. The combination of high torque, a long-legged automatic transmission, and the aerodynamic enhancements makes it an accomplished long-distance tourer. The CK32 and CM50 K conversions provide substantially more performance for those seeking it, with the CM50 K's 430 PS and over 280 km/h top speed delivering supercar-rivalling acceleration in a practical two-door package. The lowered suspension and larger wheels with low-profile tyres may transmit more road noise and impact harshness than standard fitments, particularly on coarse surfaces.

Safety Equipment and Pre-Purchase Inspection

The W208 CLK was equipped with a comprehensive suite of safety features for the 1998 model year. Standard safety equipment includes dual front airbags, door-mounted side impact airbags, anti-lock brakes (ABS), Brake Assist, Acceleration Skid Control (ASR), and seat belt pretensioners. The W208 was also equipped with a roll-over protection system on convertible models. Carlsson modifications do not typically alter the factory safety systems, but any changes to suspension, wheels, or tyres should be assessed for their effect on vehicle dynamics and safety system calibration.

When inspecting a Carlsson CLK, the following checks are recommended:

• Service history: Confirm regular maintenance at correct intervals, with invoices from Mercedes-Benz specialists or Carlsson-approved workshops.
• CK20 kit: Verify that the special water pump wheel, vibration damper, and air filter are present and correctly installed. The kit is mechanical only, with no electronic component.
• Supercharger system: On CK32 and CM50 K models, inspect the supercharger for correct operation, unusual noises, and oil leaks. Verify that the intercooler and associated pipework are intact and correctly installed.
• Engine condition: Check for oil leaks, coolant leaks, and signs of overheating. Listen for unusual noises from the timing chain and valvetrain.
• Wiring harness: On V6 and V8 models, check for biodegradable insulation deterioration. Symptoms include rough idle, misfires, and multiple random fault codes.
• Transmission: Test the five-speed automatic (722.6) for smooth shifting in all modes, checking for hesitation or harsh engagement.
• Suspension: Inspect the Carlsson sport springs and shock absorbers for correct seating and condition. Check for uneven ride height, which could indicate a broken spring or damaged damper.
• Rust: Check the wheel arches, boot lid, and underbody for corrosion, a documented concern on W208 models, particularly pre-facelift examples.
• Exhaust system: Inspect the Carlsson sport exhaust for corrosion, cracks, and secure mounting.
• Wheels and tyres: Examine Carlsson alloy wheels for cracks, kerb damage, and correct tyre sizes. Confirm the tyres are matched and within legal tread depth.
• Body and paint: Check for accident damage and verify the authenticity of Carlsson body components. Look for uneven panel gaps or evidence of poor repair.
• Interior: Verify the condition of Carlsson-specific trim, steering wheel, and seats. Check all electronic functions, including climate control and seat adjustment.
• Documentation: Confirm that the Carlsson conversion is documented and that any applicable Mercedes-Benz recalls have been completed by VIN. Note that the W208 CLK is affected by a sunroof bonding recall (2001–2011 C-Class, CLK, E-Class, and CLS vehicles) and a control unit configuration recall (2004–2015, though the W208 may be affected by earlier campaigns).

Trims, Versions, and Tuning Packages

Carlsson offered several tuning packages for the W208 CLK, and it is important to distinguish between them. The CK20 kit, based on the CLK 200 Kompressor, is the entry-level performance upgrade, with 195 PS and 280 Nm achieved through a mechanical pulley kit comprising a special water pump wheel, vibration damper, and air filter. The CK32 supercharger conversion, based on the CLK 320, adds a supercharger system to the 3.2-litre V6, producing approximately 300 PS. The CM50 K, based on the CLK 430, adds a supercharger system developed with Ogura Clutch, producing 430 PS and 650 Nm. The CM60 RS, also based on the CLK 430, increases displacement to 6.0 litres and produces 405 PS and over 600 Nm, with only two examples produced.

It is important to note that individual cars may have been modified with a selection of Carlsson components rather than a complete package, and some may have had modifications applied after initial delivery. The CK20 kit, for example, can be fitted independently of the body kit or interior upgrades. Prospective buyers should request documentation of the specific Carlsson work performed and verify that the components fitted match the claimed package.

Advantages and Disadvantages

Advantages

• Significant performance increase over the standard W208 CLK, with the CK20 producing 195 PS and 280 Nm from a purely mechanical upgrade, and the CK32 and CM50 K offering substantially more power for those seeking it.
• Distinctive and exclusive appearance thanks to Carlsson body components, alloy wheels, and interior appointments in leather and Alcantara, with the CM60 RS representing one of the rarest Carlsson conversions ever produced.
• Based on the W208 CLK, which offers a timeless Bruno Sacco design, a comfortable grand touring cabin, and a choice of coupé or convertible body styles.

Disadvantages

• Carlsson-specific parts, particularly the aerodynamic components and forged wheels, can be difficult to source and expensive to replace compared with standard Mercedes-Benz parts.
• Rust is a documented concern on W208 models, particularly pre-facelift examples, and should be carefully inspected on any potential purchase.
• The W208 platform has several age-related issues including biodegradable wiring harness failure on V6 and V8 models, and the complexity of both the platform and the Carlsson modifications can lead to significant maintenance and repair costs.

Final Verdict

The Carlsson Mercedes-Benz CLK (1998) is a compelling proposition for buyers seeking a mid-size grand tourer with enhanced performance and a high degree of exclusivity. The Carlsson tuning packages transform the already capable W208 into a more potent and visually distinctive vehicle, with verified performance figures that place it well above the standard model. The combination of a supercharged four-cylinder, supercharged V6, or enlarged V8, Carlsson chassis enhancements, and bespoke interior appointments makes it a genuinely special vehicle.

However, prospective buyers should approach any Carlsson-modified CLK with caution. The modifications add complexity and potential maintenance burden, and the condition of the specific example is more important than the badge. Rust is a particular concern on the W208, and the biodegradable wiring harness on V6 and V8 models should be carefully assessed. A well-documented car with a complete service history and evidence of proper care is essential. Buyers should budget for the possibility of expensive repairs and verify that all Carlsson components are present, functional, and correctly installed. This is not a car for the faint-hearted, but for the right buyer, it offers a rare blend of performance, exclusivity, and individuality in a distinctive grand tourer package.

Frequently Asked Questions

What engine does the Carlsson CK20 have?

The Carlsson CK20 is based on the Mercedes-Benz CLK 200 Kompressor and retains its 2.0-litre four-cylinder supercharged engine with a displacement of 1,998 cc. Carlsson's CK20 kit increases output from 192 PS to 195 PS at 5,500 rpm, with torque rising from 270 Nm to 280 Nm between 3,000 and 4,000 rpm.

What should buyers inspect before purchasing a Carlsson CLK?

Buyers should verify the authenticity of the Carlsson conversion through documentation, check the condition of Carlsson-specific components such as the alloy wheels, exhaust, suspension, and any supercharger system, and confirm that the base W208 CLK has a full service history. A thorough inspection for rust and a check of the engine wiring harness on V6 and V8 models is particularly important, as is verification of all applicable recall completion by VIN.

What distinguishes the Carlsson CK20 from a standard CLK 200 Kompressor?

The CK20 features a mechanical pulley kit that raises output to 195 PS instead of 192 PS, with torque increasing to 280 Nm. The kit comprises a special water pump wheel, a special vibration damper, a Carlsson air filter, and a Carlsson chrome badge. It is a purely mechanical upgrade with no electronic component.