🏷️ Basic Information

Make:

Mercedes-Benz

Model:

SLK300

Year:

2009

Chassis Code:

R171

Engine Code:

M272 E30

👋 Introduction

Positioning:

The 2009 Mercedes-Benz SLK300 (R171 generation) is positioned as a premium compact roadster, offering a blend of sporty performance, luxury, and advanced technology. It competes in a segment with rivals such as the BMW Z4 and Audi TT.

Strengths:

Renowned Mercedes-Benz build quality, comfortable ride for a roadster, advanced safety features, signature Vario-Roof retractable hardtop, and a refined interior.

Vehicle Features:

3.0L V6 engine, 7-speed automatic transmission, retractable hardtop, optional COMAND infotainment system, optional Bi-Xenon headlamps, heated seats, and optional AIRSCARF neck-level heating.

Convertible Roof System:

Vario-Roof: a fully automatic, electro-hydraulic retractable hardtop that converts the SLK300 from a coupe to a roadster in about 22 seconds.

📋 Manual Details

Systems Covered:

Engine mechanical, engine electrical, fuel system, exhaust system, cooling system, lubrication system, ignition system, transmission (automatic), driveline, steering, suspension, braking system, HVAC system, body electrical, body panels, interior trim, convertible roof system, diagnostics, troubleshooting, wiring diagrams, specifications, maintenance.

Wiring Diagrams:

Comprehensive, system-specific wiring diagrams for all major electrical systems, including component location and circuit descriptions.

Estimated Pages:

1500+

Type:

Official Service and Repair Manual Software

Language:

English

Format:

Software (likely PDF or proprietary executable)

📖 Manual Coverage

Engine Mechanical:

Complete disassembly, inspection, repair, and reassembly of the 3.0L V6 engine (M272 E30), including cylinder head, pistons, connecting rods, crankshaft, camshafts, timing system, oil pump, and seals.

Engine Electrical:

Detailed diagnosis and repair procedures for the engine control unit (ECU), ignition system, fuel injection system, starter, alternator, sensors (crankshaft position, camshaft position, oxygen, mass airflow, temperature), actuators, and emissions control systems.

Transmission:

Service and repair of the 7G-TRONIC 7-speed automatic transmission, including fluid changes, filter replacement, valve body diagnosis, torque converter, and electronic control module.

Brakes:

Detailed information on the anti-lock braking system (ABS), electronic stability program (ESP), brake hydraulic system, pad and rotor replacement, caliper service, brake fluid flush, and parking brake.

Suspension Steering:

Service and repair of front and rear suspension components (struts, shocks, control arms, bushings), steering rack, power steering system, wheel alignment specifications, and tire rotation.

Electrical Body:

Comprehensive coverage of the vehicle's electrical system, including lighting, power windows, central locking, mirrors, climate control, audio system, instrument cluster, airbags, convertible roof operation, and body control modules. Includes detailed wiring diagrams.

HVAC:

Service and repair of the automatic climate control system, A/C compressor, refrigerant handling, blower motor, heater core, blend door actuators, and diagnostic procedures.

Convertible Roof:

Detailed operation, maintenance, troubleshooting, and repair procedures for the electro-hydraulic retractable hardtop, including hydraulic pump, cylinders, seals, latches, and control modules.

Maintenance:

Scheduled maintenance intervals, oil and filter changes, spark plug replacement, air filter replacement, cabin filter replacement, brake fluid replacement, coolant flush, drive belt inspection/replacement, and battery service.

Troubleshooting:

Diagnostic flowcharts and procedures for common and uncommon issues, fault code interpretation (OBD-II), symptom-based troubleshooting for engine, transmission, ABS/ESP, HVAC, and electrical systems.

Repair:

Step-by-step repair instructions for all major vehicle systems, including engine component replacement, transmission overhaul, brake caliper rebuild, suspension component replacement, convertible roof mechanism repair, and body panel repair.

Diagnostics:

Detailed diagnostic trouble codes (DTCs) and their meanings, diagnostic procedures using Mercedes-Benz Star Diagnosis system or compatible OBD-II scanners, component testing procedures.

Depth:

Complete workshop manual level, suitable for professional technicians and advanced DIY enthusiasts. Covers basic maintenance to complete engine and transmission rebuilds, along with advanced diagnostic procedures.

Component Replacement:

Torque specifications for all critical fasteners, correct tool recommendations, and detailed steps for replacing individual components (e.g., sensors, gaskets, seals, engine mounts).

📊 Manual Specifications

Format Details:

Software often includes interactive diagrams, searchable text, and hyperlinked sections for efficient navigation. Compatibility with Windows operating systems is typical.

Searchability:

Software format typically offers excellent searchability, allowing users to quickly find specific terms or procedures.

Printability:

Designed for digital use, but typically allows for printing of specific sections or pages. Quality would depend on the user's printer.

Binding:

N/A (Software format)

Paper Type:

N/A (Software format)

⚙️ Engine Specifications

Engine Description:

M272 E30 - 3.0-liter (2996 cc) V6, naturally aspirated

Horsepower:

228 hp @ 6000 rpm

Torque:

221 lb-ft @ 2500-5000 rpm

Fuel Delivery:

Electronic fuel injection (Bosch Motronic ME 2.8)

Fuel Type:

Premium Unleaded Gasoline (91 octane or higher recommended)

Bore X Stroke:

88.0 mm x 83.1 mm

Compression Ratio:

10.7:1

Valve Train:

DOHC, 4 valves per cylinder with variable valve timing (VVT)

Coolant Capacity:

Approximately 8.5 liters (8.9 US quarts)

Oil Capacity:

Approximately 8.0 liters (8.5 US quarts) with filter change.

🔧 Transmission

Transmission Type:

7-speed automatic (7G-TRONIC)

Transmission Fluid Type:

MB 236.14 (e.g., Mobil ATF 134 or equivalent)

Transmission Features:

TouchShift manual shifting capability, Comfort and Sport modes.

📐 Dimensions

Length:

169.5 inches (4305 mm)

Width:

70.5 inches (1791 mm)

Height:

50.9 inches (1293 mm)

Wheelbase:

94.5 inches (2400 mm)

Curb Weight:

Approximately 3263 lbs (1480 kg)

Trunk Capacity Roof Up:

Approximately 10.2 cu ft (288 L)

Trunk Capacity Roof Down:

Approximately 6.5 cu ft (184 L)

🛡️ Safety Features

NHTSA Front Crash Test:

5-Star (for models with side airbags and pre-tensioners)

Active Safety:

Anti-lock Braking System (ABS), Electronic Stability Program (ESP), Traction Control System (TCS), Brake Assist (BAS).

Passive Safety:

Driver and passenger front airbags, front side airbags, rollover protection system (pop-up roll bars), seatbelt pre-tensioners, and anti-whiplash head restraints.

💡 Technology Features

Infotainment System:

Optional COMAND (Cockpit Management and Navigation) system with 6.5-inch color display, CD player, radio, optional navigation, and Bluetooth connectivity.

Driver Assistance Features:

Cruise control, optional parking assist, optional Bi-Xenon headlamps with cornering function.

Connectivity Options:

Bluetooth hands-free communication, optional SiriusXM satellite radio, optional USB/auxiliary input.

🔧 Maintenance

Oil Change Interval:

Every 10,000 miles or 12 months, whichever comes first (depending on driving conditions and oil type).

Major Service Interval:

Around 30,000 miles or 3 years, often including spark plug replacement, brake fluid flush, and transmission fluid/filter service.

Engine Oil Type:

SAE 0W-40 or 5W-40 synthetic engine oil meeting MB 229.5 or MB 229.51 specification.

Coolant Type:

Mercedes-Benz approved coolant (e.g., MB 325.0 or 326.0), typically a blue or green ethylene glycol based antifreeze/coolant.

Brake Fluid Type:

DOT 4 Plus (low viscosity, high performance)

Power Steering Fluid:

Pentosin CHF 11S or an equivalent hydraulic fluid specified by Mercedes-Benz.

Common Issues:

Timing chain wear/tensioner failure in M272 engines (though less prevalent in later models), oil cooler gasket leaks, ABS wheel speed sensor failures, convertible roof hydraulic leaks or microswitch issues, and ignition coil failures.

M272 Engine Timing Issue Context:

The M272 V6 engine is known for potential premature wear of the timing chain and plastic timing chain sprockets/tensioners. While Mercedes-Benz extended warranties or recalls addressed some of these, it's a critical check, especially at higher mileage. The manual will provide procedures for inspection and replacement.

📚 Vehicle History

Mercedes Benz Heritage:

Founded in 1926, Mercedes-Benz has a long-standing reputation for engineering excellence, luxury, and safety in the automotive industry.

Slk Evolution:

The SLK-Class (R171) was introduced in 2004 as the second generation of Mercedes-Benz's compact roadster, succeeding the R170. It featured updated styling, improved aerodynamics, and the innovative Vario-Roof retractable hardtop. The SLK300 replaced the SLK280 for the 2009 model year.

Production Years:

R171 generation: 2004-2011. SLK300 specific: 2009-2011.

Manufacturing Location:

Bremen, Germany

🏆 Awards & Recognition

Safety Awards:

Often received high safety ratings from organizations like the IIHS and NHTSA, reflecting Mercedes-Benz's commitment to safety.