🏷️ Basic Information Identification Make: Oldsmobile Model: 98 Year: 1991 Codes Platform Code: GM H-body 👋 Introduction Market Position Target Audience: DIY enthusiasts, independent repair shops, Oldsmobile 98 owners Competitive Analysis Comparison To Print: More convenient, easily accessible, and often more up-to-date than older printed manuals. Offers search functionality. Key Features Data Source: Licensed OE (Original Equipment) materials from RepairSurge Convenience: Instant online access, searchable content, accessible on multiple devices Value Proposition: Cost savings by enabling DIY repairs, access to factory-level information 📋 Manual Details Coverage Areas Primary Coverage: Full Service and Repair Secondary Coverage: Maintenance, Diagnostics, Troubleshooting, Wiring Diagrams Page Count Estimated Pages: 1000+ Manual Type Type: Software Service and Repair Manual Language Language: English Format Format: Online, Web-Based Access Access Duration: 1 Year Subscription 📖 Manual Coverage Systems Covered Powertrain: Engine, Transmission, Drivetrain (Front-Wheel Drive) Chassis: Suspension, Steering, Brakes, Wheels & Tires Electrical: All Electrical Systems, Wiring Diagrams, Lighting, Instrumentation, Power Accessories Body: Exterior Body Panels, Interior Trim, Glass, Doors, Bumpers, HVAC System Procedures Included Diagnostics: Troubleshooting guides, fault code interpretation Maintenance: Scheduled maintenance, fluid changes, filter replacements, tune-ups Repair: Component removal, installation, and adjustment for all major systems Rebuilding: Engine, transmission, and major component rebuild procedures Bodywork: Body panel repair, glass replacement, door mechanisms Technical Depth Depth: Comprehensive: From basic fluid checks to complete engine and transmission overhauls, including detailed electrical schematics and diagnostic procedures. 📊 Manual Specifications File Format Software Compatibility: Web browser compatible (PC, laptop, smartphone, tablet) Print Quality Print Capability: Printable pages via web browser interface Binding Type Binding: N/A (Digital Access) Paper Type Paper Quality: N/A (Digital Access) ⚙️ Engine Specifications Primary Engine Engine Type: V8 Overhead Valve (OHV) Displacement: 5.0 L / 307 cu. in. Bore X Stroke: 3.736 in. x 3.498 in. (94.9 mm x 88.8 mm) Compression Ratio: 8.0:1 Horsepower: 140 hp @ 3200 RPM (approx.) Torque: 230 lb-ft @ 2000 RPM (approx.) Fuel System Fuel Delivery: Electronic Fuel Injection (EFI), Throttle Body Injection (TBI) Fuel Type: Unleaded gasoline, 87 Octane (Minimum) Ignition System Ignition Type: Distributorless Ignition System (DIS) or Distributor Ignition (DI) depending on specific sub-model/build Cooling System Coolant Type: Ethylene Glycol (Green) Coolant Capacity: 15.0 Quarts (14.2 Liters) 🔧 Transmission Standard Transmission Type: 4-speed Automatic Transmission Model: 4T60-E (Hydra-Matic) Features Drive Type: Front-Wheel Drive (FWD) Fluid Specifications Transmission Fluid Type: Dexron-III (or equivalent specification) Fluid Capacity Transmission Fluid Capacity: Approx. 6.5 Quarts (6.2 Liters) 📐 Dimensions Exterior Length: 203.7 inches (5174 mm) Width: 74.5 inches (1892 mm) Height: 56.0 inches (1422 mm) Wheelbase: 110.8 inches (2814 mm) Weights Curb Weight: 3,700 - 3,800 lbs (1678 - 1724 kg) approx. Gross Vehicle Weight Rating: 4,900 lbs (2223 kg) approx. 🛡️ Safety Features Passive Features Airbags: Driver-side airbag standard Seat Belts: Front: Shoulder/Lap belts; Rear: Lap belts Child Safety Locks: Rear door child safety locks Active Features Brakes Front: Power-assisted front disc brakes Brakes Rear: Power-assisted rear drum brakes ABS: Anti-lock Braking System (ABS) available on some models 💡 Technology Features Infotainment Audio System: AM/FM stereo, cassette player, optional CD player, optional premium sound systems Climate Control HVAC Type: Manual or Automatic Climate Control (ACC) Convenience Features Power Accessories: Power windows, power door locks, power mirrors, power seats, cruise control Driver Assistance Cruise Control: Standard on most models 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,000 miles or 3 months, whichever comes first (or as per manual recommendation based on driving conditions). Tire Rotation Interval: Every 6,000 miles or 6 months Transmission Fluid Change Interval: Check every 15,000 miles; change as needed or every 30,000-50,000 miles (refer to manual for specific conditions). Fluid Specifications Engine Oil Viscosity: SAE 5W-30 Engine Oil Capacity: 4.0 Quarts (3.8 Liters) with filter change Power Steering Fluid: Dexron-II or Dexron-III Brake Fluid Type: DOT 3 Known Issues Common Complaints: Water pump leaks, intake manifold gasket leaks (especially on 3.3L V6 models if equipped), electrical component failures (sensors, actuators), suspension wear (bushings, ball joints), climate control system issues (blend doors, AC compressor). Diagnostic Challenges: Early electronic fuel injection and transmission control systems can be complex to diagnose without specialized tools and knowledge, which this manual provides. 📚 Vehicle History Brand Heritage Brand Focus: Oldsmobile was a division of General Motors known for its innovative features and appeal to a mature, comfortable driving audience. Model Evolution Generation Introduction: The 1991 Oldsmobile 98 was part of the seventh generation of the 98 model, introduced for the 1991 model year, marking a significant redesign. Design Philosophy: Styled by Bill Porter, it featured a more aerodynamic and modern profile than its predecessors, emphasizing comfort and luxury. Production Production Years Of Model: 1940-1996 (across various generations) Assembly Location: Lansing, Michigan, USA 🏆 Awards & Recognition Recognitions Model Segment: Full-size luxury sedan Ratings Safety Ratings: NHTSA ratings for this era were generally lower than modern standards. Specific ratings for 1991...