🏷️ Basic Information Identification Make: Oldsmobile Model: Cutlass Supreme Year: 1991 Codes Platform Code: GM W-body Generation Generation: Fourth Generation (1990-1996) 👋 Introduction Market Position Market Position: The 1991 Oldsmobile Cutlass Supreme was positioned as a mid-size personal luxury coupe and sedan, offering a comfortable ride and stylish appearance within the General Motors lineup. This manual software targets owners and independent repair shops seeking a convenient and comprehensive resource for maintaining and repairing this specific model. Competitive Analysis Competitive Analysis: Competed with vehicles like the Ford Taurus, Chevrolet Lumina, and Chrysler LeBaron Coupe. The availability of official, licensed repair software for this model provides a significant advantage over generic repair guides or out-of-print physical manuals, offering accurate and up-to-date factory specifications. Key Features Key Features: Licensed OE (Original Equipment) information, instant online access, multi-device compatibility, year-long access with renewal options, detailed diagrams and illustrations, diagnostic procedures, maintenance schedules. Designed for ease of use by DIY enthusiasts. 📋 Manual Details Coverage Areas Coverage Areas: Engine, Drivetrain, Suspension, Steering, Brakes, Electrical System, HVAC, Body & Chassis, Diagnostic Procedures, Maintenance Schedules, Wiring Diagrams, Technical Specifications, Troubleshooting Guides Page Count Page Count: Digital Access (estimated 1000+ pages equivalent) Manual Type Manual Type: Service and Repair Manual Software Language Language: English Format Format: Online/Digital Access (PC, Laptop, Smartphone, Tablet compatible) 📖 Manual Coverage Systems Covered Systems Covered: Engine mechanicals (3.1L V6, 3.4L V6), Engine control systems (ECM), Fuel system, Ignition system, Exhaust system, Cooling system, Lubrication system, Transmission (4-speed automatic), Power steering, Suspension components (front struts, rear shocks, control arms), Brake system (front disc, rear drum), ABS (if equipped), Electrical system (charging, starting, lighting, accessories), Body control modules, HVAC system, Diagnostic trouble codes (DTCs), Wiring diagrams for all major systems. Procedures Included Procedures Included: Routine maintenance (oil changes, filter replacements, fluid checks), Engine tune-ups, Fuel system diagnosis and repair, Ignition system testing, Cooling system maintenance and repair, Brake system servicing (pad replacement, caliper overhaul), Suspension component replacement, Steering system service, Electrical troubleshooting, HVAC system diagnosis, Drivetrain component inspection and repair, Bodywork repair procedures, Diagnostic procedures for common and intermittent faults, Overhaul procedures for major components. Technical Depth Technical Depth: Comprehensive, factory-derived information suitable for DIY enthusiasts and professional technicians. Covers from basic fluid checks to in-depth engine and transmission overhauls, including detailed diagnostic flowcharts and specifications. 📊 Manual Specifications File Format File Format: Proprietary online platform accessed via web browser Print Quality Print Quality: N/A (Digital) Binding Type Binding Type: N/A (Digital) Paper Type Paper Type: N/A (Digital) ⚙️ Engine Specifications Primary Engine Primary Engine: 3.1L (189 ci) V6 (RPO LHO) Secondary Engine Secondary Engine: 3.4L (204 ci) V6 (RPO LQ1 - Performance variant, less common for '91 Cutlass Supreme, more prevalent in other W-body vehicles) Performance Horsepower 3.1L: 140 hp @ 4800 rpm Torque 3.1L: 180 lb-ft @ 3200 rpm Fuel System Fuel System: Multi-port Fuel Injection (MPFI) Engine Layout Engine Layout: Front-wheel drive, transversely mounted V6 engine Compression Ratio 3.1L Compression Ratio 3.1L: 8.5:1 Bore X Stroke 3.1L Bore X Stroke 3.1L: 3.50 in x 3.27 in Ignition System Ignition System: Distributorless Ignition System (DIS) with coil packs 🔧 Transmission Standard Transmission Standard: 4-speed automatic (THM-440-T4 / 4T60-E) Optional Transmission Optional: None offered for 1991 Cutlass Supreme Features Transmission Features: Electronically controlled, overdrive, torque converter lock-up Fluid Type Transmission Fluid Type: Dexron III (or equivalent) 📐 Dimensions Exterior Wheelbase: 107.5 inches Overall Length: 198.9 inches Overall Width: 70.1 inches Overall Height: 53.5 inches (Coupe) / 54.5 inches (Sedan) Weights Curb Weight: Approx. 3,300 - 3,450 lbs Gross Vehicle Weight Rating Gvw: Approx. 4,400 lbs Interior Front Headroom: 38.6 inches Rear Headroom: 36.9 inches Front Legroom: 42.4 inches Rear Legroom: 35.1 inches 🛡️ Safety Features Ratings NHTSA Frontal Driver Rating 1991: Not rated or unavailable for this model year in standard format. Active Features Active Features: Anti-lock Braking System (ABS) - Optional, Front disc brakes, Rear drum brakes, Power-assisted steering. Passive Features Passive Features: 3-point front seat belts, Lap belts for rear occupants, Energy-absorbing steering column, Side guard door beams, Padded interior surfaces. 💡 Technology Features Infotainment Infotainment System: AM/FM stereo with cassette player, optional CD player, manual or power antenna, speaker configurations vary by trim level. Driver Assistance Driver Assistance Features: Cruise control (standard or optional depending on trim), intermittent wipers. Connectivity Connectivity: Basic analog systems, no modern Bluetooth or USB connectivity. 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,000 miles or 3 months (typical for the era, consult manual for specific oil type recommendations) Engine Coolant Flush: Every 30,000 miles or 2 years Automatic Transmission Service: Every 30,000 miles or 2 years (fluid and filter change) Spark Plug Replacement: 30,000 - 60,000 miles (depending on plug type, consult manual) Fluid Specifications Engine Oil Specification: API Service SG, SF, or CD, SAE 5W-30 or 10W-30 (refer to manual for precise temperature range...