Positioning:
The 2009 Mercedes-Benz SL550 (R230) represents the pinnacle of luxury grand touring convertibles, combining advanced technology, powerful performance, and sophisticated styling.
Competitors:
Competed against models such as the Porsche 911 Cabriolet, BMW 6 Series Convertible, and Jaguar XK Convertible.
Highlights:
Retractable hardtop (Vario-Roof), Active Body Control (ABC) suspension, powerful V8 engine, luxurious interior, advanced safety features.
Powertrain:
Engine (4.7L V8 M273), Transmission (7G-TRONIC 722.9), Exhaust, Fuel System, Cooling System, Ignition System.
Chassis:
Suspension (ABC - Active Body Control), Steering, Brakes (ABS, ESP), Wheels, Tires.
Electrical:
Engine Control Module (ECM), Body Control Module (BCM), Lighting, Instrumentation, Infotainment, Power Systems, CAN Bus Diagnostics.
Body And Interior:
Body Panels, Doors, Seats, Convertible Top System (Vario-Roof), Climate Control (HVAC), Interior Trim, Restraint Systems (Airbags, Seatbelts).
Maintenance:
Scheduled maintenance intervals, fluid checks and changes, filter replacements, lubrication.
Diagnostics:
Troubleshooting flowcharts, diagnostic trouble codes (DTCs), electrical schematic interpretation, component testing.
Repair:
Engine overhaul, transmission repair, brake system repair, suspension component replacement, electrical component repair, convertible top mechanism repair.
Special Procedures:
Vario-Roof system calibration and repair, ABC system bleeding and component replacement, SDS (Star Diagnostic System) integration for module programming and configuration.
Depth:
Detailed technical specifications, assembly/disassembly procedures with torque values, wiring diagrams, component locations, system overviews, and diagnostic strategies for professional technicians and advanced DIY enthusiasts.
Configuration:
4.7L (4663 cc) DOHC 32-valve V8
Horsepower:
382 hp @ 6000 rpm
Torque:
391 lb-ft @ 2800-4500 rpm
Induction:
Naturally Aspirated, Electronic Fuel Injection (EFI)
Engine Oil Type:
SAE 0W-40 Synthetic (MB Approval 229.5)
Coolant Type:
Mercedes-Benz Approved Antifreeze/Coolant (e.g., ZEREX G-48 or equivalent MB-approved product), typically a 50/50 mix.
Bore X Stroke:
92.9 mm x 86.0 mm
Compression Ratio:
10.7:1
Transmission Type:
7-speed Automatic (7G-TRONIC)
Optional Transmission:
N/A for SL550 in 2009
Transmission Features:
TouchShift paddle shifters, Comfort, Sport, and Manual modes.
Transmission Fluid Type:
MB Specification 236.14 (e.g., Pentosin ATF134 or equivalent MB-approved ATF)
Transmission Fluid Capacity:
Approx. 9.0 liters (check manual for exact figure during service)
NHTSA Rating:
Not specifically rated, but equipped with advanced safety systems.
Active Safety:
Anti-lock Braking System (ABS), Electronic Stability Program (ESP), Brake Assist (BAS), Active Body Control (ABC) with cross-wind stabilization, Tire Pressure Monitoring System (TPMS).
Passive Safety:
Front and side airbags, head airbags, pop-up roll bar, seatbelt pretensioners, crumple zones.
Infotainment System:
COMAND (Cockpit Management and Navigation).
Features:
AM/FM radio, CD player, HDD navigation, Bluetooth connectivity, optional Harman Kardon surround sound system, voice control.
Driver Assistance Features:
Distronic (adaptive cruise control), Parktronic (parking sensors), Bi-Xenon headlamps with Active Curve Illumination.
Connectivity Options:
Bluetooth for hands-free calling and audio streaming.
Minor Service:
Every 10,000 miles or 12 months (whichever comes first), includes oil and filter change, tire rotation, multi-point inspection.
Major Service:
Around 30,000 miles or 3 years (includes items from minor service plus cabin air filter, engine air filter replacement, brake fluid flush, transmission fluid and filter service - consult manual for specific intervals and items).
Brake Fluid Type:
DOT 4 Plus (MB Approval 331.0)
Engine Oil Capacity:
Approx. 8.5 liters (with filter change)
Common Issues:
ABC suspension leaks (struts, hydraulic lines), Vario-Roof hydraulic cylinder leaks or mechanism failures, ignition coil failures, mass air flow sensor issues, potential rust on underbody components if exposed to harsh climates.
Example Oil Filter P N:
A2731800009 (Consult manual or parts catalog for exact part number for your VIN)
Heritage:
Mercedes-Benz has a long-standing reputation for producing high-quality, luxurious, and technologically advanced vehicles, particularly in the sports car and luxury convertible segments.
R230 Generation:
The R230 generation of the SL-Class (2003-2011) was known for its significant technological advancements, including the introduction of Active Body Control (ABC) and the retractable vario-roof.
Manufacturing Location:
Bremen, Germany
Prestigious Awards:
While specific awards for the 2009 SL550 are not as widely publicized as some other models, the SL-Class consistently receives accolades for its design, performance, and luxury from automotive publications worldwide.
Consumer Satisfaction:
Generally high consumer satisfaction for luxury, performance, and build quality, though maintenance costs can be a factor.
