🏷️ Basic Information

Make:

Mercedes-Benz

Model:

SLK-Class

Chassis Code:

R172

Model Year:

2018

Generation Code:

Third Generation (R172)

Generation Start Year:

2011

Generation End Year:

2020

Product Identifier:

Mercedes Benz SLK Class R172 Complete Workshop Service Repair Manual 2018

👋 Introduction

Segment:

Compact Premium Sports Car / Roadster

Target Audience:

Enthusiasts seeking a luxury, sporty convertible experience with Mercedes-Benz engineering.

Key Competitors:

BMW Z4, Audi TT Roadster, Porsche Boxster.

Distinctive Feature:

Vario-roof (retractable hardtop) offering coupe-like security and convertible freedom.

Driver Experience:

Focus on agile handling, powerful engine options, and luxurious interior appointments.

Diy Benefit:

Enables owners to perform a wide range of maintenance and repair tasks, saving significant costs on dealership labor.

Diagnostic Benefit:

Provides detailed diagnostic procedures and information essential for identifying and rectifying complex issues.

📋 Manual Details

Coverage Scope:

All models, engines, trims, and transmission types within the R172 SLK-Class for the 2018 model year.

Estimated Page Count:

Extensive (Specific page count not provided, but implied to be comprehensive A-Z coverage).

Type:

Workshop Service Repair Manual

Language:

English

Format:

Downloadable Digital Format (PDF compatible)

📖 Manual Coverage

Engine:

Engine mechanical, engine management, fuel system, cooling system, lubrication system, ignition system, emissions control.

Transmission:

Automatic transmission (e.g., 7G-TRONIC PLUS) and potentially manual transmission (if offered in 2018 R172), including control systems, hydraulics, and overhaul.

Drivetrain:

Driveshafts, differentials, axles, and related components.

Suspension:

Front and rear suspension systems, shock absorbers, springs, control arms, steering knuckles.

Steering:

Power steering system, steering column, steering gear, linkages.

Brakes:

Hydraulic brake system, ABS, ESP, brake discs, pads, calipers, lines, parking brake.

Electrical System:

Battery, alternator, starter motor, wiring diagrams, fuses, relays, lighting systems, power windows, seats, mirrors.

Body And Frame:

Body panels, chassis, doors, hood, trunk lid, convertible hardtop mechanism, interior trim, glass, bumpers.

HVAC:

Heating, ventilation, and air conditioning system, climate control, refrigerant circuits, components.

Infotainment And Navigation:

Audio system, COMAND system, navigation, Bluetooth, telematics (diagnosis and basic operation).

Safety Systems:

Airbag system (SRS), seat belt pre-tensioners, restraint systems, driver assistance systems (e.g., PARKTRONIC, COLLISION PREVENTION ASSIST).

Maintenance:

Scheduled maintenance, oil changes, filter replacements, fluid checks and top-offs, brake fluid replacement, spark plug replacement.

Troubleshooting:

Diagnostic procedures for common issues, fault code interpretation, step-by-step troubleshooting guides for various systems.

Repair:

Component removal, installation, adjustment, and rebuilding procedures for all covered systems.

Diagnostics:

OBD-II diagnostics, sensor testing, actuator testing, module programming (basic guidance).

Special Tools:

Identification and usage of specialized tools required for specific repairs.

Technical Specifications:

Torque specifications, clearances, fluid capacities, electrical values, diagnostic data.

Depth:

Comprehensive from basic maintenance to in-depth repair and diagnostics, suitable for both DIY enthusiasts and professional technicians.

📊 Manual Specifications

File Type:

PDF

Searchability:

Likely searchable text within the PDF for easy information retrieval.

Printability:

High-quality, suitable for printing individual pages or entire sections.

Binding:

N/A (Digital Download, printing is user-dependent).

Paper Quality:

N/A (Digital Download, printing is user-dependent).

⚙️ Engine Specifications

Engine Variant Example 1:

SLK 250 (M274 DE20 LA) - 2.0L Turbocharged Inline-4

Engine Variant Example 2:

SLK 300 (M274 DE20 LA) - 2.0L Turbocharged Inline-4 (Upgraded tune)

Engine Variant Example 3:

SLK 350 (M276 DE35 LL) - 3.5L Naturally Aspirated V6 (Potentially phased out or replaced by turbo V6 for 2018, but common in R172).

Engine Variant Example 4:

AMG SLC 43 (M276 DELA30 LA) - 3.0L Twin-Turbocharged V6 (The R172 SLK was rebranded as SLC from 2016, this is highly relevant for 2018).

Horsepower Range:

Approximately 200 hp to 362 hp depending on the engine variant.

Torque Range:

Approximately 229 lb-ft to 384 lb-ft depending on the engine variant.

Fuel Injection:

Direct Injection (Bosch or Continental systems typical).

Fuel Type:

Premium Unleaded Gasoline (91 octane or higher recommended).

🔧 Transmission

Transmission Type:

7G-TRONIC PLUS (7-speed automatic transmission).

Transmission Type Manual:

Manual transmission (less common in later R172 models, especially for 2018, but may be covered if present).

Transmission Control:

Electronic control with various driving modes (e.g., Comfort, Sport).

Transmission Fluid Type:

Specific Mercedes-Benz Automatic Transmission Fluid (e.g., MB 236.14 or MB 236.15 depending on variant).

📐 Dimensions

Length:

Approx. 171.5 inches (4358 mm)

Width:

Approx. 70.5 inches (1790 mm)

Height:

Approx. 53.1 inches (1348 mm)

Seating Capacity:

2

Trunk Volume Hardtop Up:

Approx. 10.1 cubic feet (285 liters)

Trunk Volume Hardtop Down:

Approx. 6.4 cubic feet (180 liters)

Curb Weight:

Approx. 3300 - 3500 lbs (1497 - 1588 kg) depending on engine and options.

🛡️ Safety Features

NHTSA Rating Example:

Likely received high ratings from NHTSA and IIHS, consistent with Mercedes-Benz safety standards (specific ratings for 2018 R172 would require direct lookup).

ABS:

Anti-lock Braking System

Esp:

Electronic Stability Program

Traction Control:

Traction Control System (ASR)

Driver Assistance:

Optional: ATTENTION ASSIST, COLLISION PREVENTION ASSIST, Blind Spot Assist, Lane Keeping Assist.

Airbags:

Front airbags, side airbags, head airbags, knee airbags (driver).

Rollover Protection:

Pop-up rollover bars integrated behind the headrests.

Seat Belts:

3-point safety belts with pre-tensioners and belt force limiters.

💡 Technology Features

Infotainment System:

COMAND (Cockpit Management and Navigation) system with 7-inch display.

Audio System:

Standard premium audio, optional Harman Kardon surround sound system.

Adaptive Cruise Control:

Optional DISTRONIC PLUS (though typically more prevalent on S-Class and E-Class, may be available on higher trims).

Parking Assistance:

Optional PARKTRONIC with Parking Guidance.

Bluetooth:

Bluetooth connectivity for hands-free calling and audio streaming.

Usb Ports:

USB and auxiliary input ports for external media devices.

Keyless Go:

Optional Keyless-Go starting and entry system.

Vario Roof Control:

Operation and maintenance of the electro-hydraulic retractable hardtop, including remote operation.

🔧 Maintenance

Oil Change Interval:

Typically every 10,000 miles (16,000 km) or 1 year, whichever comes first, depending on driving conditions and specific engine oil used (refer to manual for precise intervals).

Brake Fluid Change:

Every 2 years, regardless of mileage.

Engine Air Filter:

Inspect every 20,000 miles (32,000 km), replace as needed. Typically every 40,000 miles (64,000 km).

Cabin Air Filter:

Replace annually or every 15,000 miles (24,000 km).

Engine Oil Specification:

MB Approval 229.5 or 229.51 (e.g., Mobil 1, Shell Helix Ultra) with viscosity grades like 0W-40 or 5W-30 depending on climate and specific engine.

Coolant Type:

Mercedes-Benz Specification 325.0 (Blue/Green Antifreeze) or 326.0 (Concentrate).

Power Steering Fluid:

Specific hydraulic fluid (MB 343.0 or equivalent).

Convertible Top Mechanism:

Potential issues with hydraulic leaks, microswitches, or pump failures in the Vario-roof system; requires specific diagnostic procedures.

Engine M274:

Some reports of PCV valve issues, potential oil consumption on early units, turbocharger wastegate actuator problems.

Transmission 7G Tronic:

Occasional issues with solenoid blocks or torque converter lock-up clutch, especially with higher mileage. Requires specific diagnostic tools for adaptation.

Electrical Gremlins:

As with many modern Mercedes-Benz vehicles, battery voltage issues or minor sensor faults can sometimes lead to spurious warning lights or system malfunctions.

📚 Vehicle History

Heritage:

Mercedes-Benz has a long-standing history of producing luxury vehicles, sports cars, and roadsters, exemplified by models like the 300 SL Gullwing and SL-Class roadsters.

Previous Generation:

R171 SLK-Class

Facelift:

The R172 received a significant facelift for the 2016 model year, which included a name change to SLC-Class, updated styling, and powertrain revisions.

Production Location:

Bremen, Germany

🏆 Awards & Recognition

Segment Awards:

The SLK/SLC-Class has historically been recognized for its design and driving dynamics in the sports car segment (specific awards for 2018 model year would vary).

Reliability Rankings:

Mercedes-Benz vehicles generally rank well in initial quality but may vary in long-term reliability depending on the specific model and powertrain. Referencing consumer reports or JD Power for specific model year data is recommended.