🏷️ Basic Information Identification Make: Mercedes-Benz Model: SL320 Year: 1997 Codes Chassis Code: R129 👋 Introduction Market Position Vehicle Segment: Luxury Grand Tourer Convertible Competitive Analysis Key Competitors 1997: BMW 8 Series Convertible, Jaguar XK8 Convertible, Porsche 911 Carrera Cabriolet (993 generation) Key Features Vehicle Highlights: Retractable Hardtop (optional on some earlier models, standard R129 evolution), powerful inline-six engine, refined ride, premium interior, advanced safety features for its era. Manual Value Proposition Target Audience: Mercedes-Benz SL320 (R129) owners, independent repair shops, automotive enthusiasts seeking in-depth knowledge. 📋 Manual Details Coverage Areas Primary Coverage: Complete Service, Repair, and Workshop Procedures Secondary Coverage: Troubleshooting and Diagnostics Page Count Estimated Pages: Hundreds (specific number not provided, but indicated as extensive) Manual Type Type: Factory Service Repair Workshop Manual Language Language: English (implied by description context) Format Format: PDF (Downloadable) 📖 Manual Coverage Systems Covered Powertrain: Engine (M104), Transmission (4-speed automatic) Chassis: Suspension, Steering, Brakes, Drivetrain Electrical: Engine Control Unit (ECU), Body Electronics, Lighting, Instrumentation, Power Accessories Body: Body and Trim, Convertible Top System, Exterior and Interior Components Procedures Included Maintenance: Scheduled Maintenance, Fluid Changes, Filter Replacements, Inspections Repair: Component Removal, Installation, Reassembly, Overhaul Troubleshooting: Diagnostic Procedures, Symptom-Based Troubleshooting, Fault Code Interpretation Diagnostics: Electrical System Diagnostics, Mechanical Component Diagnostics Technical Depth Depth: Comprehensive: Covers everything from basic maintenance to complete engine and transmission overhauls, including detailed electrical schematics and diagnostic procedures. 📊 Manual Specifications File Format Compatibility: Fully compatible with Windows and MAC computers. Print Quality Printability: Printable: Allows printing of single pages or the entire manual. Binding Type Binding: Digital (PDF Download) Paper Type Paper Quality: N/A (Digital Format) Usage Rights Licensing: Lifetime Use: No expiry dates, no renewal fees, usable on multiple devices and computers. Content Quality Visuals: Hundreds of detailed photos and diagrams, including highly detailed exploded diagrams. ⚙️ Engine Specifications Primary Engine Engine Code: M104.992 Engine Type: 3.2L (3199 cc) Inline 6-Cylinder, DOHC, 24 Valves Performance Horsepower Est: 228 hp @ 5500 rpm Torque Est: 232 lb-ft @ 3750 rpm Fuel System Injection Type: Bosch Motronic M3.1 Fuel Injection Cooling System Coolant Type Spec: MB Specification 325.0 (Glysantin G48 or equivalent blue/green antifreeze) Engine Oil Oil Spec API: API SJ or higher Oil Viscosity: SAE 0W-30 or 5W-40 recommended for most climates Oil Capacity Qts: 7.4 quarts (7.0 liters) with filter 🔧 Transmission Standard Transmission Type: 4-speed Automatic Transmission Code: 722.6 (Introduced later in R129 production, check VIN for exact spec - earlier might have 4-speed 722.4 or 722.5 if SL500 was base) Features Shift Modes: Comfort (C) and Sport (S) modes Fluid Specifications Transmission Fluid Type: MB Specification 236.10 (ATF LT 71141 or equivalent) Fluid Capacity Transmission Fluid Capacity Lts: Approximately 8 liters (for complete fluid change, pan drop is less) 📐 Dimensions Exterior Length In: 187.8 inches (4770 mm) Width In: 70.5 inches (1790 mm) Height In: 51.2 inches (1300 mm) Weights Curb Weight Lbs Est: 3900 - 4100 lbs (1769 - 1860 kg) depending on options Wheels Tires Standard Wheel Size: 16-inch Alloy (e.g., 7.5J x 16 ET37) Standard Tire Size: 225/55 R16 Bolt Pattern: 5x112 🛡️ Safety Features Ratings NHTSA Rating Type: Not applicable for individual component ratings in this era; tested as a whole vehicle. Active Features ABS: Standard (Anti-lock Braking System) Traction Control: ASR (Acceleration Slip Regulation) - Standard Passive Features Airbags: Driver and Passenger Airbags Rollover Protection: Automatic Pop-up Roll Bar (integrated safety feature) 💡 Technology Features Infotainment Audio System: Bose Premium Sound System (optional) with AM/FM radio, cassette player. CD changer integration likely present. Climate Control: Automatic Climate Control (ACC) Driver Assistance Cruise Control: Standard electronically controlled cruise control. Convenience Convertible Top Operation: Electrically operated soft top with integrated hardtop for storage, powered by hydraulic system. Seats: Power adjustable front seats with memory function, heated seats (optional). 🔧 Maintenance Service Intervals Oil Change Interval Miles: Every 10,000 miles (16,000 km) or 1 year, whichever comes first (check manual for specific conditions). Major Service Interval Miles: Major service typically around 30,000 miles or annually, covering more comprehensive checks and component replacements. Fluid Specifications Brake Fluid Spec: DOT 4 (MB Specification 331.0) Power Steering Fluid Spec: MB Specification 236.3 (ATF Dexron II or equivalent) Coolant Capacity Lts: Approximately 10.5 liters Known Issues Common Problems Electrical: Wiring harness degradation (especially in engine bay), EIS (Electronic Ignition Switch) failures, SRS (Supplemental Restraint System) indicator lights. Common Problems Mechanical: Concealed soft-top hydraulic lines (leaks), distributor-less ignition system (later M104s), cooling system components (water pump, thermostat), mass airflow sensor (MAF). Common Problems Body: Convertible top mechanism (slow operation, hydraulic leaks), door seal degradation, rust (less common than older models but can occur). Filter Part Numbers Example Oil Filter Part Number: Mann-Filter W 102/23 or Mercedes-Benz A104 180 01 09 Air Filter Part Number: Mann-Filter C 26 132/1 or Mercedes-Benz A104 094 15 04 📚 Vehicle History Brand Heritage...