🏷️ Basic Information Identification Make: Porsche Model: 928 S4 Year: 1987 Market: European (Euro) Codes Chassis Code: 928 Engine Code Variant: M28/47 (32-valve V8) 👋 Introduction Market Position Positioning: Luxury Grand Tourer (GT), positioned as a front-engine, rear-wheel-drive alternative to rear-engined Porsche models. Competitive Analysis Competitors: Ferrari 412, Aston Martin V8 Vantage, Jaguar XJ-S, Mercedes-Benz SEC models. Key Features Design: Timeless Giugiaro-influenced styling, aerodynamic profile, 'transaxle' layout for balanced weight distribution. Performance Orientation: Powerful V8 engine, comfortable for long-distance touring, advanced (for its time) technology. Target Audience Audience: Affluent buyers seeking a sophisticated, high-performance, and comfortable sports car for touring. 📋 Manual Details Coverage Areas General Operation: Yes Maintenance: Yes Safety Systems: Yes Controls And Instruments: Yes Technical Data: Yes Troubleshooting: Basic (Owner Level) Page Count Estimated Pages: Approx. 250-300 pages Manual Type Type: Owner's Manual Language Language: English Format Format: Printed Booklet 📖 Manual Coverage Systems Covered Engine System: Overview, lubrication, cooling, fuel system basics, ignition system basics Transmission System: Automatic transmission operation, fluid level checks Braking System: ABS operation, parking brake Electrical System: Fuse box locations and identification, battery care, lighting system Chassis And Body: Doors, windows, seats, climate control, exterior lighting, security system basics Wheels And Tires: Tire pressure recommendations, wheel changing procedures Comfort And Convenience: HVAC system, power accessories, cruise control Procedures Included Regular Maintenance: Oil change intervals, fluid top-offs (coolant, brake fluid, power steering fluid, washer fluid) Checking Fluids: Detailed instructions for checking all vehicle fluids Tire Maintenance: Recommended tire pressures, advice on tire wear Lighting Operation: Headlights, taillights, interior lighting, fog lights Emergency Procedures: Jump starting, tire changing, basic troubleshooting guidance Technical Depth Depth: Owner-level operation, maintenance, and basic care. Does NOT contain detailed repair procedures or diagnostic charts. 📊 Manual Specifications File Format Format: Printed paper Print Quality Quality: Original factory print quality Binding Type Binding: Stapled or perfect bound (typical for period) Paper Type Paper: Standard automotive manual paper stock ⚙️ Engine Specifications Primary Engine Engine Type: Naturally Aspirated V8 Displacement: 5.0 Liters (4973 cc) Bore X Stroke: 97.0 mm x 84.0 mm Valvetrain: SOHC, 4 valves per cylinder (32 valves total) Compression Ratio: 10.0:1 Performance Horsepower: 310 PS (228 kW) @ 6000 rpm (Euro spec) Torque: 450 Nm (332 lb-ft) @ 4500 rpm (Euro spec) Fuel System Fuel Delivery: Bosch L-Jetronic Fuel Injection Fuel Type: Unleaded Premium Gasoline (RON 95-98) Cooling System Capacity: Approx. 11.0 Liters Lubrication System Oil Capacity: Approx. 8.0 Liters (with filter) 🔧 Transmission Standard Type: 4-Speed Automatic (Tiptronic optional on later models, not standard on '87 Euro) Transmission Controller: Electronic control for smooth shifting Features Transaxle Layout: Rear transaxle design (engine front, gearbox rear) for optimal weight distribution. Fluid Type Automatic Transmission Fluid: Dexron III (or equivalent, check specific manual for exact spec) 📐 Dimensions Exterior Length: 4655 mm (183.3 in) Width: 1780 mm (70.1 in) Height: 1280 mm (50.4 in) Wheelbase: 2500 mm (98.4 in) Front Track: 1520 mm (59.8 in) Rear Track: 1514 mm (59.6 in) Weights Curb Weight: Approx. 1650 kg (3638 lbs) Gross Vehicle Weight: Approx. 2040 kg (4497 lbs) Weight Distribution: Approx. 50/50% front/rear (due to transaxle) 🛡️ Safety Features Ratings Crash Test Data: Limited data available for 1987 models; modern standards do not apply. Designed with occupant safety as a priority for its era. Active Features ABS: Standard Anti-lock Braking System (ABS) Suspension: Self-leveling rear suspension (standard on S4) for consistent ride height and handling. Passive Features Seatbelts: Three-point inertia-reel seatbelts, front and rear. Airbags: Not standard on 1987 models; introduced later. Body Structure: Reinforced safety cage, crumple zones. 💡 Technology Features Infotainment Audio System: Original cassette player with AM/FM radio, often with amplifier system. Features may include tone controls and balance/fader. Climate Control: Automatic climate control (HVAC) with integrated air conditioning. Driver Assistance Cruise Control: Standard electronic cruise control. Instrumentation: Comprehensive analog gauges, including tachometer, speedometer, oil pressure, coolant temperature, and voltmeter. Connectivity Features: No modern connectivity features (Bluetooth, USB, Apple CarPlay, Android Auto) present in the original configuration. 🔧 Maintenance Service Intervals Oil Change: Every 10,000 km or annually, whichever comes first (recommendation based on period norms, check manual for exact value). Major Service: Timing belt replacement recommended every 40,000-60,000 km or 5 years (crucial for V8 engine). Fluid Specifications Engine Oil: SAE 10W-40 or 15W-50 API SF or SG (check manual for precise specification). Coolant: Porsche approved coolant (typically ethylene glycol based with corrosion inhibitors), 50/50 mix with distilled water. Brake Fluid: DOT 4 Power Steering Fluid: Dexron II or equivalent Known Issues Common Wear Items: Fuel lines, cooling hoses, timing belts, valve stem seals, suspension bushings, door seals, window regulators. Electrical Gremlins: Common in older vehicles, can include issues with dashboard instruments, door locks, or alarm systems due to aging wiring and components. Fuel System: Fuel pump and injector issues can arise with age and mileage. 📚...