🏷️ Basic Information Identification Make: Porsche Model: 928 Trim: S4 Year: 1989 👋 Introduction Market Position Positioning: High-performance luxury grand tourer, positioned as a premium GT offering advanced technology and comfort. Competitive Analysis Competitors: Ferrari 412, Aston Martin V8 Vantage, Jaguar XJS, BMW 8 Series (though the 8 Series arrived later, it represented a similar segment focus). Key Features Gran Turismo Focus: Designed for comfortable high-speed touring with a powerful engine and refined interior. Transaxle Layout: Rear transaxle (transmission and differential) for optimal weight distribution (50/50). Engine Placement: Front-engine, rear-wheel drive configuration. Innovative Design: Aerodynamic styling, integrated bumpers, pop-up headlights. 📋 Manual Details Coverage Areas General Operation: Comprehensive Maintenance Schedule: Detailed Troubleshooting Guide: Included Safety Features: Explained Technical Specifications: Extensive Instrumentation Controls: Detailed Climate Control: Explained Audio System: Operation Lighting Systems: Operation Wheels Tires: Information Towing Information: Included Emergency Procedures: Detailed Page Count Estimated Pages: Approximately 300-400 pages (typical for this era and model) Manual Type Type: Owner's Manual Language Language: English Format Format: Printed Booklet 📖 Manual Coverage Systems Covered Powertrain: Engine, Fuel System, Exhaust System, Cooling System, Lubrication System Transmission: Automatic Transmission (Tiptronic-like features may be referenced in later manuals, but primarily automatic for 1989 S4) Chassis: Suspension, Steering, Brakes, Wheels, Tires Electrical: Battery, Charging System, Ignition System, Lighting, Fuses, Relays, Instruments, Wipers, Horn, Power Accessories Body: Doors, Locks, Windows, Seats, Interior Trim, Exterior Trim, Convertible Top (if applicable, but 928 is coupe), Body Panels Climate Control: HVAC System Operation and Controls Safety Systems: Seatbelts, Airbags (if equipped for the model year, though 1989 was early for full driver/passenger airbags as standard), ABS (Anti-lock Braking System) Procedures Included Basic Maintenance: Oil Changes, Fluid Checks, Filter Replacements, Tire Pressure Checks Tire Service: Inflation, Rotation, Changing a Flat Tire (Spare location and jack operation) Battery Care: Jump Starting, Battery Maintenance Washer Fluid Refill: Location and Refilling Wiper Blade Replacement: Instructions Fuse Replacement: Fuse Box Locations and Fuse Identification Emergency Operation: Vehicle Start-up, Emergency Braking, Vehicle Recovery Troubleshooting: Common issues and diagnostic indicators Technical Depth Depth: Owner-level maintenance and operation. Does not typically include in-depth diagnostic procedures or repair instructions found in service manuals. 📊 Manual Specifications File Format Type: Physical Print Print Quality Quality: Original Factory Print (may vary based on condition of used item) Binding Type Type: Perfect Bound or Stapled Booklet Paper Type Type: Standard Quality Paper with Glossy Cover ⚙️ Engine Specifications Primary Engine Engine Type: V8 Displacement: 5.0 Liters (4973 cc) Valvetrain: SOHC (Single Overhead Camshaft), 4 valves per cylinder (20 valves total) Bore X Stroke: 95.0 mm x 86.6 mm Compression Ratio: 10.0:1 Performance Horsepower: 320 hp (235 kW) @ 6000 rpm Torque: 317 lb-ft (430 Nm) @ 4500 rpm Fuel System Induction: Bosch LH-Jetronic Fuel Injection, Electronic Ignition (Distributorless ignition system often referred to as EDIS or similar on later models, but early 1989 S4 still had distributor for some markets/builds). Fuel Type: Unleaded Premium Gasoline (91 Octane or higher) Fluid Capacity Engine Oil: Approx. 9.5 Liters (10 US Quarts) with filter Fluid Specifications Engine Oil Grade: API SG or higher, SAE 5W-40 or 10W-40 (check manual for specific recommendations based on climate) 🔧 Transmission Standard Type: 4-speed Automatic (Tiptronic introduced later, but this manual covers the standard automatic). Optional Type: 5-speed Manual (rare, but was an option in some markets) Features Automatic Modes: Likely included 'Economy' and 'Sport' modes to alter shift points. Fluid Capacity Automatic Transmission Fluid: Approx. 10 Liters (10.6 US Quarts) Fluid Specifications Automatic Transmission Fluid Type: Dexron III or equivalent (check manual for specific Porsche specification) 📐 Dimensions Exterior Length: 4650 mm (183.1 in) Width: 1785 mm (70.3 in) Height: 1280 mm (50.4 in) Wheelbase: 2550 mm (100.4 in) Weights Curb Weight: Approx. 1560 kg (3439 lbs) Gross Vehicle Weight Rating: Approx. 2050 kg (4519 lbs) Wheels Tires Standard Wheels: 16-inch Alloy Wheels Optional Wheels: 17-inch Cup or Design 90 Wheels (common upgrade) Standard Tire Size: Front: 225/50VR16, Rear: 245/45VR16 (check manual for exact spec) Bolt Pattern: 5x130 mm 🛡️ Safety Features Ratings Crash Test Data: Limited public crash test data available for this specific year and model. Porsche's engineering focused on occupant protection through structural integrity. ABS was standard on S4. Active Features ABS: Standard Anti-lock Braking System Traction Control: Traction control (ASR - Automatic Slip Regulation) was often an option or standard on later models, may be listed as optional for 1989. Passive Features Seatbelts: Three-point inertia reel seatbelts with pretensioners Airbags: Driver's side airbag was optional or standard on late '89 models, check specific vehicle build. Passenger airbags were less common or optional. Rollover Protection: Reinforced A-pillars and roof structure 💡 Technology Features Infotainment Audio System: Original factory stereo system (e.g., Blaupunkt or Becker), typically with AM/FM radio and cassette player. Options for CD changers might have been available. Driver Assistance ABS: Anti-lock Braking System (ABS)...