Target Audience:
Owners, independent repair shops, enthusiasts
Competitors:
Mercedes-Benz W123/W124, Audi 100, Volvo 740/760, Cadillac Seville
Vehicle Focus:
Sporty handling, refined luxury, powerful inline-six engine
Manual Value Proposition:
Essential resource for maintaining and repairing a classic German luxury sedan, saving on dealership costs
Engine:
Complete overhaul, diagnostics, fuel injection (Bosch L-Jetronic), ignition system, cooling, lubrication, exhaust
Transmission:
Manual and automatic transmission overhaul, diagnostics, fluid changes, clutch system
Drivetrain:
Rear axle, differential, driveshafts, CV joints
Suspension:
Front and rear suspension components, shock absorbers, springs, bushings, alignment
Brakes:
Front and rear brake systems (disc brakes), ABS (if equipped), parking brake, hydraulic system
Steering:
Power steering system, steering rack, tie rods
Electrical:
Complete wiring diagrams, fuse box layouts, battery, alternator, starter, lighting, instrumentation, power windows, central locking
Bodywork:
Body panel removal/installation, door mechanisms, glass, seals, interior trim
HVAC:
Heating, ventilation, and air conditioning (HVAC) system diagnostics and repair
Maintenance:
Scheduled maintenance, fluid level checks, filter replacements, tune-ups
Diagnostics:
Troubleshooting guides, fault code interpretation (where applicable for the era), common problem identification
Repair:
Component replacement, adjustment procedures, rebuild instructions
Installation:
Installation guides for specific components
Depth:
Comprehensive, covering basic to advanced repairs, diagnostics, and full engine/transmission rebuilds
Type:
Inline 6-cylinder, SOHC
Displacement:
2.5 liters (2494 cc)
Bore X Stroke:
84.0 mm x 75.0 mm
Compression Ratio:
8.8:1 (typical)
Horsepower Net:
150 hp @ 5500 rpm (typical)
Torque Net:
160 lb-ft @ 3500 rpm (typical)
Injection Type:
Bosch L-Jetronic Electronic Fuel Injection
Fuel Type:
Unleaded Premium Gasoline (91+ Octane)
Type:
Electronic Ignition (Distributorless or Distributor-based, depending on specific market variant)
Type:
4-speed Manual (Getrag 260)
Type:
3-speed Automatic (ZF 4HP22)
Clutch:
Single dry plate, hydraulically actuated
Manual Transmission Fluid:
API GL-4, SAE 75W-90 or 80W-90
Automatic Transmission Fluid:
Dexron III/Mercon (or equivalent)
Oil Change:
Every 5,000-7,500 miles (8,000-12,000 km) or annually, whichever comes first (consult manual for precise recommendation)
Spark Plugs:
Typically every 20,000-30,000 miles (32,000-48,000 km)
Timing Belt:
N/A (M30 is a timing chain engine)
Engine Oil:
API SG/SH, SAE 10W-40 or 15W-40 (consult manual for viscosity based on climate)
Engine Oil Capacity:
6.5 liters (6.9 US quarts)
Coolant:
BMW Blue Antifreeze/Coolant (50/50 mix with distilled water)
Brake Fluid:
DOT 3 or DOT 4
Engine Management:
Degradation of fuel injection components, ignition coil failure, fuel pump issues
Cooling System:
Radiator leaks, water pump failure, thermostat issues
Suspension:
Worn control arm bushings, ball joints, shock absorbers
Rust:
Common rust points include wheel arches, rocker panels, and around windows
Electrical:
Faulty headlight relays, door lock actuators, window regulators
Philosophy:
Sheer Driving Pleasure, engineering excellence
E28 Introduction:
Introduced in 1981 as a successor to the E12, the E28 was BMW's second generation of the 5 Series.
E28 Significance:
Marked advancements in aerodynamics, safety, and technology for BMW sedans. The 525i was a popular mid-range model.
Production Years:
E28 Series: 1981-1987
Manufacturing Locations:
Germany, South Africa, Mexico, Thailand, South Korea
E28 Reputation:
Renowned for its driving dynamics, build quality, and performance, solidifying BMW's reputation as a maker of driver's cars.
Consumer Reports History:
Generally rated well for reliability and performance, though common wear-and-tear issues typical of older vehicles apply.
Manual Quality:
Professional technical documentation, essential for DIY mechanics and professional service.
