Target Audience:
Enthusiasts, owners seeking detailed repair information, independent repair shops specializing in BMW
Competitors Era:
Mercedes-Benz W124, Audi 100/200, Volvo 700 Series, Jaguar XJ
Vehicle Philosophy:
The E28 generation represents a mature expression of BMW's 'Ultimate Driving Machine' ethos, blending luxury with performance and refined engineering.
Manual Value Proposition:
Provides indispensable, factory-authentic information essential for maintaining, troubleshooting, and repairing these classic BMWs, ensuring longevity and optimal performance.
Engine Mechanical:
Engine overhaul, cylinder head, block, pistons, crankshaft, camshafts, timing, valve train
Fuel System:
Fuel injection system (Bosch Motronic), fuel pump, injectors, pressure regulator, fuel tank
Ignition System:
Ignition coils, spark plugs, distributor (if applicable), ECU control
Cooling System:
Radiator, water pump, thermostat, hoses, fan, coolant specifications
Exhaust System:
Exhaust manifold, catalytic converter (if applicable), mufflers, pipes, emissions control
Transmission Manual:
Manual transmission overhaul, clutch, shifter mechanism, fluid specifications
Transmission Automatic:
Automatic transmission overhaul, torque converter, hydraulic system, fluid specifications
Drivetrain:
Driveshafts, universal joints, differential, rear axle assembly
Suspension:
Front suspension (MacPherson struts), rear suspension (semi-trailing arms), springs, shock absorbers, bushings, alignment specifications
Steering:
Power steering system, steering rack, pump, hoses, tie rods, alignment
Brakes:
Front and rear disc brakes, ABS (Anti-lock Braking System), brake calipers, rotors, pads, master cylinder, brake lines, fluid specifications
Electrical System Engine:
Engine control unit (ECU), sensors, wiring diagrams for engine management
Electrical System Chassis:
Lighting, wipers, horn, power windows, power seats, central locking, wiring diagrams
Climate Control:
HVAC system, blower motor, heater core, A/C compressor, refrigerant, controls
Bodywork Exterior:
Body panel removal and installation, doors, hood, trunk, bumpers, glass, trim
Bodywork Interior:
Dashboard, interior trim panels, seating, carpet, headliner
Routine Maintenance:
Oil changes, filter replacements, spark plug replacement, fluid checks and changes, belt inspections
Troubleshooting:
Diagnostic procedures for common problems, symptom-based troubleshooting guides
Repair Procedures:
Step-by-step instructions for component replacement and repair across all systems
Overhaul Rebuild:
Complete engine, transmission, and differential rebuild procedures
Electrical Diagnostics:
Wiring diagrams, component testing, troubleshooting electrical faults
Specifications Data:
Torque specifications, clearances, measurements, fluid capacities
Depth:
Comprehensive factory-level detail for professional technicians and advanced DIY enthusiasts
Diagnostic Capability:
Detailed diagnostic strategies and specific test procedures for all major systems
Component Level:
Coverage extends to the level of individual component disassembly, inspection, and reassembly
Oil Change Interval:
Typically every 7,500-10,000 miles or annually, depending on driving conditions and oil type used.
Coolant Flush:
Every 2 years or 24,000 miles.
Spark Plug Replacement:
Around 30,000 miles for standard plugs; refer to manual for specific types.
Timing Belt Chain:
M30 engines use a timing chain, which is designed to last the life of the engine but requires inspection for wear and tensioner condition.
Engine Oil Type:
API SG or SH, SAE 15W-40 or 10W-40 (check specific viscosity for climate).
Coolant Type:
BMW Blue or G48 equivalent antifreeze (ethylene glycol based), mixed 50/50 with distilled water.
Brake Fluid Type:
DOT 3 or DOT 4.
Transmission Fluid Manual:
GL-4 75W-90 or 80W-90 gear oil (check specific manual for recommendations).
Transmission Fluid Automatic:
ZF TE-ML 11A or TE-ML 11B (often referred to as Dexron II/III in later specifications, but original spec is critical).
Cooling System Leaks:
Common radiator leaks, hose failures, and water pump seal deterioration. Check for white residue around connections.
Rubber Component Degradation:
Age-related failure of suspension bushings, engine mounts, vacuum hoses, and fuel lines.
Electrical Gremlins:
Corrosion on connectors, failing relays, and wear in wiring harnesses can lead to intermittent electrical issues.
Fuel Injector Clogging:
Can affect performance and fuel economy, often resolved with cleaning or replacement.
Clutch Wear:
Wear and tear on the clutch components (disc, pressure plate, release bearing) is a common maintenance item for manual transmissions.
