Positioning:
The BMW E28 5 Series was positioned as a premium executive sedan, offering a blend of luxury, performance, and advanced engineering for its era.
Competitors:
Competed with other luxury sedans of the period such as the Mercedes-Benz W123/W124 E-Class, Audi 100, and Jaguar XJ.
Distinctive Attributes:
Known for its sophisticated engineering, robust build quality, comfortable ride, driver-focused interior, and excellent inline-six engines. The 525i specifically offered a balance of performance and economy within the E28 lineup.
Value:
Provides professionals and enthusiasts with the authoritative technical documentation required for maintaining and repairing the BMW 525i E28, ensuring authenticity and optimal performance.
Engine:
Detailed engine overhaul, diagnosis, tuning, component replacement (pistons, rings, bearings, valves, camshaft, crankshaft, cylinder head, block), fuel injection (Bosch L-Jetronic/Motronic), ignition system, cooling system, lubrication system
Transmission:
Manual and automatic transmission overhaul, repair, fluid changes, clutch system, driveshaft, differential
Brakes:
Hydraulic system diagnosis and repair, ABS (if equipped), disc brake overhaul (calipers, rotors, pads), drum brake service (rear), parking brake, brake fluid specifications
Electrical:
Complete wiring diagrams, component testing, starter, alternator, battery, lighting system, ignition system troubleshooting, fuse/relay identification, instrument cluster diagnosis, power windows, locks, mirrors
Suspension Steering:
Front and rear suspension component replacement (shocks, struts, springs, control arms, bushings), steering system overhaul (rack and pinion, tie rods, power steering pump), wheel alignment specifications
Body Chassis:
Body panel repair, rust prevention, interior trim removal and installation, glass replacement, door and trunk latch mechanisms, chassis lubrication
Climate Control:
Air conditioning system service, heater core replacement, blower motor, HVAC controls
Maintenance:
Scheduled maintenance (oil changes, filter replacements, spark plugs, coolant, brake fluid), tune-up procedures, lubrication points
Troubleshooting:
Diagnostic flowcharts, common fault diagnosis, symptom-based troubleshooting guides
Repair Rebuild:
Complete engine rebuild procedures, transmission overhauls, suspension component replacement, electrical component repair, bodywork restoration
Technical Data:
Torque specifications for all fasteners, engine timing procedures, diagnostic trouble codes (DTCs) if applicable to the era, electrical resistance values
Depth:
Comprehensive, suitable for professional mechanics and advanced DIY enthusiasts, covering everything from basic maintenance to complete engine and transmission rebuilds.
Engine Type:
Inline-6 Cylinder, DOHC (Double Overhead Camshaft)
Displacement Cc:
2494 (for M30B25)
Bore Stroke Mm:
84.0 x 75.0
Compression Ratio:
8.8:1 (typical)
Horsepower Ps:
150-170 PS (depending on market and specific engine variant, e.g., 170 PS for 525i in many markets)
Torque Nm:
220-230 Nm (depending on market and specific engine variant)
Fuel Delivery:
Bosch L-Jetronic or Motronic fuel injection system
Fuel Type:
Unleaded Gasoline (Premium)
Ignition Type:
Electronic Ignition (distributor-based or distributorless in later Motronic systems)
Coolant Type:
Ethylene Glycol based coolant (BMW recommends specific formulations)
Transmission Type:
Getrag 260 5-speed manual transmission (common)
Transmission Type:
ZF 4HP22 4-speed automatic transmission
Clutch Type:
Single dry plate, hydraulic actuation
Manual Transmission Fluid:
API GL-4 or GL-5, SAE 75W-90 or 80W-90 (check specific BMW recommendations)
Automatic Transmission Fluid:
Dexron II (or equivalent specification, consult manual for exact BMW approval)
Crash Test Data:
Limited formal crash test data available for this era according to modern standards. However, the E28 was known for its robust safety cage and build integrity.
ABS:
Optional Anti-lock Braking System (ABS) available on later models.
Traction Control:
Not typically available on E28 models.
Airbags:
Driver's airbag became optional/standard on later models (post-1985/86).
Seatbelts:
Three-point inertia-reel seatbelts (front and rear)
Crumple Zones:
Designed with front and rear crumple zones for energy absorption.
Audio System:
Factory cassette player with optional CD changer. Sound systems often featured premium brands like Blaupunkt or Nakamichi in higher trims.
Instrument Cluster:
Comprehensive analog gauges including tachometer, speedometer, fuel, coolant temperature, oil pressure (on some models), and economy meter.
Cruise Control:
Standard or optional cruise control system.
Trip Computer:
Basic trip computer functions may be present on some later models.
Bluetooth Usb:
Not available in original factory configuration. Aftermarket solutions are common.
Oil Change:
Typically every 5,000-7,500 miles (8,000-12,000 km) or annually, depending on driving conditions. Consult manual for exact intervals.
Spark Plugs:
15,000-30,000 miles (24,000-48,000 km) for standard plugs; longer for platinum/iridium if specified.
Coolant Flush:
Every 2-3 years or 30,000-50,000 miles (48,000-80,000 km).
Brake Fluid Flush:
Every 2 years.
Engine Oil Capacity:
6.5 liters (6.9 US quarts) with filter for M30 engine (check manual for exact capacity).
Engine Oil Viscosity:
10W-40 or 20W-50 recommended for typical use, depending on climate. BMW preferred oil specifications should be consulted.
Coolant Capacity:
Approximately 10-11 liters (check manual).
Brake Fluid Type:
DOT 3 or DOT 4 (check manual for specific BMW recommendation)
Common Failures:
Cooling system (radiator, hoses, water pump), fuel pump, fuel injectors, idle control valve (ISV), sway bar links, oil pan gasket leaks, vacuum leaks, rust in common areas (wheel arches, rocker panels).
Electrical Gremlins:
Aging wiring harnesses and connectors can lead to intermittent electrical issues, particularly with aging insulation.
Timing Belt:
M30 engine uses a timing chain, not a belt, which is generally more durable but requires regular chain tensioner and guide checks.
Bmw Legacy:
BMW's reputation for building driver-focused, high-performance sedans with excellent engineering underpins the E28's development and appeal.
E28 Development:
The E28 was the second generation of the BMW 5 Series, succeeding the E12. It introduced significant refinements in styling, chassis dynamics, and engine technology.
Facelift Updates:
Key updates included larger bumpers, improved aerodynamics, revised interior, and the introduction of Motronic fuel injection and ABS on later models.
Production Period:
1981-1988
Manufacturing Locations:
Primary production in Dingolfing, Germany; assembly also occurred in other BMW plants worldwide.
Car And Driver 10Best:
The E28 5 Series, including the 525i, was frequently recognized on Car and Driver's '10Best' lists during its production years, highlighting its enduring appeal and performance.
Reliability Reputation:
Generally considered a reliable vehicle when properly maintained, with its robust mechanicals being a strong point. However, age-related wear and tear are significant factors.
Industry Standard Compliance:
Adheres to all relevant automotive engineering and safety standards of the 1980s.
