Market Position:
The Mercedes-Benz SLK-Class (R171) is a compact, two-seater luxury roadster known for its retractable hardtop (VARIO-ROOF), sporty handling, and premium interior. The SLK300 variant represents a mid-range performance option within the SLK lineup for 2009, offering a balance of power and efficiency.
Competitors:
Competed against models like the BMW Z4, Audi TT Roadster, Porsche Boxster, and Chevrolet Corvette (though the Corvette is a more direct competitor to higher SLK models).
Key Features:
VARIO-ROOF (retractable hardtop), AIRSCARF (neck-level heating system in seats), COMAND infotainment system, premium interior materials, agile chassis.
Coverage Areas General:
Introduction, Instrument Cluster, Entertainment Systems, Climate Controls, Lights, Driver Controls, Locks and Security, Seating and Safety Restraints, Driving, Customer Assistance, Reporting safety defects (U.S.only), Cleaning, Maintenance and Specifications, Engine compartment, Engine oil, Battery, Fuel information, Air filter(s), Part numbers, Refill capacities, Lubricant specifications, Accessories, Service Information and Specifications, Maintenance Information and Specifications
Systems Covered:
Instrument cluster functions, infotainment system operation, climate control settings, exterior and interior lighting, driver assistance controls, locking mechanisms, security systems, seat adjustments, airbag system, occupant restraints, driving modes, basic cleaning procedures, engine bay components, engine oil requirements, battery maintenance, fuel system information, air filtration system, accessory operation, general service information, maintenance schedules.
Procedures Included:
Operation of various vehicle systems, basic troubleshooting guidance, maintenance item checks, safety feature explanations, cleaning recommendations, understanding dashboard warnings, refueling procedures, accessory usage.
Technical Depth:
Owner-level operation, maintenance, and basic troubleshooting. Does not include in-depth diagnostic procedures or repair instructions typically found in a Service Manual.
Engine Type:
M272 E30 (3.0L V6)
Displacement:
2996 cc (3.0 Liters)
Configuration:
V6, 24 Valves (4 per cylinder), DOHC (Double Overhead Camshafts) with variable valve timing
Horsepower:
228 hp @ 6000 rpm
Torque:
221 lb-ft @ 2500-5000 rpm
Fuel Injection:
Sequential Multi-Port Fuel Injection (MPI)
Fuel Type:
Premium Unleaded Gasoline (91 Octane or higher recommended)
Emission Control:
Catalytic Converter, On-Board Diagnostic System (OBD-II)
Engine Oil Type:
Mobil 1 Synthetic SAE 0W-40 (per factory spec MB 229.5)
Engine Oil Capacity:
Approximately 6.9 US quarts (6.5 Liters) with filter change
Air Filter Part Number Example:
A 272 090 00 70 (This is an example, actual part numbers may vary slightly and should be verified via VIN)
Transmission Type:
7G-TRONIC Automatic Transmission
Drive Type:
Rear-Wheel Drive (RWD)
Transmission Features:
Sport mode, manual shifting mode (TouchShift levers on steering wheel or selector lever), adaptive shift logic.
Transmission Fluid Type:
MB 236.14 (e.g., ATF LT 71141 or equivalent approved fluid)
Transmission Fluid Capacity:
Approximately 7.9 US quarts (7.5 Liters) for a complete fluid change (may vary with torque converter)
Length:
160.7 inches (4082 mm)
Width:
69.5 inches (1766 mm)
Height:
50.9 inches (1293 mm)
Wheelbase:
94.5 inches (2400 mm)
Curb Weight:
Approximately 3351 lbs (1520 kg)
Gross Vehicle Weight Rating:
Approximately 4299 lbs (1950 kg)
Trunk Volume Hardtop Up:
Approximately 10.2 cu ft (288 L)
Trunk Volume Hardtop Down:
Approximately 6.2 cu ft (174 L)
NHTSA Front Impact Rating:
5-Star (for driver and passenger)
IIHS Front Impact Rating:
Good
Airbags:
Driver and front passenger airbags, side airbags (integrated into seats), knee airbags (driver).
Roll Over Protection:
Pop-up roll bars behind headrests activated by sensors.
Seat Belts:
3-point inertia-reel seat belts with pre-tensioners and force limiters, integrated seatbelt extenders.
ABS:
Anti-lock Braking System (ABS)
Esp:
Electronic Stability Program (ESP) with Traction Control System (TCS)
Braking System:
Vented front discs, solid rear discs.
Infotainment System Name:
COMAND (Cockpit Management and Navigation)
Infotainment Features:
Optional navigation system, AM/FM/Weather Band radio, CD player, optional SiriusXM Satellite Radio, optional Bluetooth connectivity for hands-free calling.
Driver Assistance Features:
Cruise control, optional bi-xenon headlamps with active curve illumination, optional PARKTRONIC parking assist.
Comfort Technology:
AIRSCARF (optional, warm air outlets in headrests), heated seats, power-adjustable seats with memory, automatic climate control, rain-sensing wipers.
Service Intervals General
Service Interval Schedule:
Mercedes-Benz typically follows an 'Assyst' or 'Assyst Plus' service system, which calculates service intervals based on driving conditions and time. Intervals are generally around 10,000 miles or 12 months for minor services, with major services recommended at higher mileage intervals. Specific intervals for items like brake fluid, coolant, and transmission fluid are detailed in the manual.
Coolant Type:
Mercedes-Benz approved coolant (e.g., MB 325.0 or MB 326.0, typically a silicate-free organic acid technology (OAT) based coolant)
Brake Fluid Type:
DOT 4 Plus (MB 331.0)
Power Steering Fluid:
MB 236.3 (or equivalent approved fluid, typically mineral oil based)
Common Issues R171:
The M272 V6 engine is known for potential balance shaft sprocket wear leading to check engine lights and rough running (often addressed under extended warranty or recalls). Leaks from the rear main seal or valve cover gaskets can occur. VARIO-ROOF hydraulic system issues (pump, cylinders, hoses) are also documented. Window regulator failures. Early models had some ignition coil issues.
Standard Tire Size:
Front: 225/45R17, Rear: 245/40R17 (Sport package may have different sizes)
Wheel Bolt Pattern:
5x112
Maintenance Schedule Items
Items Covered:
Engine oil and filter change, air filter replacement, cabin air filter replacement, spark plug replacement, brake fluid flush, coolant flush, transmission fluid and filter service, differential fluid check/change, belt inspection/replacement, tire rotation and pressure checks.
Brand Heritage:
Mercedes-Benz has a long-standing reputation for engineering excellence, luxury, safety, and innovation, dating back to the invention of the automobile.
R171 Generation Intro:
The R171 generation of the SLK-Class was introduced for the 2004 model year, replacing the R170. It featured a more aggressive styling, improved aerodynamics, and the introduction of the advanced VARIO-ROOF system.
2009 Updates:
For the 2009 model year, Mercedes-Benz updated the R171 facelift, including minor styling tweaks, updated infotainment options, and revised suspension tuning. The SLK300 replaced the previous SLK280, featuring the 3.0L V6.
Production Location:
Bremen, Germany
