🏷️ Basic Information Identification Make: Mercedes-Benz Model: SL-Class Model Code: R129 Year: 1990 Generation Generation Name: Third Generation (R129) Generation Start Year: 1989 Generation End Year: 2001 Codes Chassis Code: R129 👋 Introduction Market Position Positioning: Flagship luxury convertible, aimed at affluent buyers seeking performance, comfort, and advanced engineering. Target Demographic: High-net-worth individuals, enthusiasts of German engineering and luxury grand tourers. Competitive Analysis Key Competitors: Porsche 911 Targa/Cabriolet, Jaguar XJ-S, BMW 8 Series (E31), Ferrari 348/F355. Key Features Design Philosophy: Emphasis on safety, advanced technology, and refined performance, setting a new benchmark for open-top motoring. Innovations: Integrated roll-over bar, advanced ABS, multi-link rear suspension, electro-hydraulic convertible top system. 📋 Manual Details Coverage Areas Model Variants Covered: All R129 SL models for 1990, including 300SL, 300SL-24, 500SL Repair Scope: A-Z (All repairs from basic maintenance to complete overhauls) Page Count Estimated Page Count: 1000+ Manual Type Type: Factory Service and Repair Manual Purpose: Used by dealership technicians Language Language: English Format Format: Digital (likely PDF) or Printed 📖 Manual Coverage Systems Covered Engine Mechanical: Engine assembly, cylinder head, crankshaft, pistons, connecting rods, timing system, lubrication system Engine Management: Fuel injection (KE-Jetronic/LH-Jetronic), ignition system, emissions control, engine control unit (ECU) diagnosis Transmission Manual: Manual transmission (if applicable for specific models, though R129 was primarily automatic) Transmission Automatic: 4-speed automatic transmission (e.g., 722.3, 722.4) repair, overhaul, and control systems Drivetrain: Driveshafts, differential, axles Suspension: Front suspension (struts, control arms, ball joints), rear suspension (multi-link), springs, shock absorbers, self-leveling suspension (if equipped) Steering: Power steering system, steering column, steering gear Brakes: Hydraulic system, ABS (Anti-lock Braking System), brake discs, pads, calipers, lines, parking brake Electrical System: Battery, charging system, starter, lighting, fuses, relays, wiring diagrams Body And Chassis: Body panels, doors, hood, trunk lid, convertible top mechanism (hydraulic/electric), frame structure Comfort And Convenience: Climate control (HVAC), power seats, power windows, power mirrors, central locking, cruise control Safety Systems: Roll-over protection system (automatic deployment), seat belts, airbags (driver side initially on R129) Procedures Included Maintenance: Scheduled maintenance (oil changes, filter replacements, fluid checks), brake service, tune-ups Diagnostics: Troubleshooting guides, symptom-based diagnostics, diagnostic trouble codes (DTCs) Repair And Rebuild: Component removal, installation, repair, and complete overhaul procedures for all major systems Calibration: Engine control unit calibration, sensor adjustments Wiring Diagrams: Detailed electrical schematics for all systems Specifications And Tolerances: Torque values, clearances, measurements, and wear limits Technical Depth Depth: Comprehensive; covers routine maintenance, complex diagnostics, component-level repair, and complete system overhauls 📊 Manual Specifications File Format Format Details: Likely a high-resolution PDF, optimized for digital viewing and printing of individual pages. Searchable text functionality is a common feature of quality digital manuals. Print Quality Quality: High-resolution images, clear diagrams, crisp text. Designed for clarity and accuracy. Binding Type Type: For printed versions: Likely professional perfect binding or lay-flat spiral binding for ease of use in a workshop environment. Paper Type Type: For printed versions: Durable, glossy or semi-gloss paper stock to withstand workshop conditions. ⚙️ Engine Specifications Primary Engine Engine Code 300Sl: M103.980 Engine Type 300Sl: 3.0L SOHC Inline-6 Displacement 300Sl: 2962 cc (180.7 cu in) Bore X Stroke 300Sl: 88.5 mm x 80.25 mm Compression Ratio 300Sl: 9.2:1 Engine Code 300Sl-24: M104.980 Engine Type 300Sl-24: 3.0L DOHC Inline-6 (24-valve) Engine Code 500Sl: M119.960 Engine Type 500Sl: 5.0L DOHC V8 (32-valve) Performance Horsepower 300Sl: 187 hp @ 5700 rpm Torque 300Sl: 195 lb-ft @ 4400 rpm Horsepower 300Sl-24: 228 hp @ 6400 rpm Torque 300Sl-24: 203 lb-ft @ 4600 rpm Horsepower 500Sl: 322 hp @ 5500 rpm Torque 500Sl: 347 lb-ft @ 3900 rpm Fuel System Fuel System Type: Bosch KE-Jetronic (300SL), Bosch LH-Jetronic (300SL-24, 500SL) Fuel Type: Premium Unleaded Gasoline (91 octane or higher) Oil Capacity Oil Capacity Approx: 7.5-8.5 liters (depending on engine) Coolant Capacity Coolant Capacity Approx: 10-12 liters (depending on engine) 🔧 Transmission Standard Transmission Type 300Sl 300Sl-24: 4-speed Automatic (722.3 or 722.4) Transmission Type 500Sl: 4-speed Automatic (722.3) Optional Optional Transmission: None offered for R129 SL models in 1990. Features Transmission Features: Comfort and Sport modes, torque converter lock-up Fluid Type Automatic Transmission Fluid: MB 236.1 Specification (e.g., MB 000 989 88 03 10, or equivalent ATF like Dexron III/Mercon) Fluid Capacity Automatic Transmission Fluid Capacity: Approx. 7-8 liters (fill) 📐 Dimensions Exterior Length: 4470 mm (176.0 in) Width: 1810 mm (71.3 in) Height: 1304 mm (51.3 in) Wheelbase: 2515 mm (99.0 in) Front Track: 1532 mm (60.3 in) Rear Track: 1524 mm (60.0 in) Cargo Trunk Volume: Approx. 230-250 liters (with convertible top up) Weights Curb Weight 300Sl: Approx. 1770 kg (3902 lbs) Curb Weight 500Sl: Approx. 1810 kg (3990 lbs) Gross Vehicle Weight Rating: Approx. 2100-2150 kg Wheels Tires Wheel Size Standard: 15-inch alloy wheels Tire Size Standard: 205/65 VR15 Bolt Pattern: 5x112 mm 🛡️ Safety Features Ratings Safety Ratings: NHTSA and IIHS ratings are not readily available for...