Reputation:
Known for engineering excellence, driving dynamics, and build quality
Competitors:
Mercedes-Benz W123, Audi 100, Volvo 240
Design Philosophy:
Focus on driver engagement, robust mechanicals, and understated luxury
Target Audience:
Professionals, enthusiasts seeking a sophisticated and reliable German sedan
Engine:
M30B32, M30B28 (Engine mechanical, lubrication, cooling, fuel delivery, ignition, emissions control)
Transmission:
Manual (Getrag 260) and Automatic (ZF 4HP22) (overhaul, adjustment, troubleshooting)
Drivetrain:
Clutch, driveshaft, differential, rear axle assembly (disassembly, inspection, repair)
Suspension:
Front struts, rear trailing arms, anti-roll bars, bushings (diagnosis, replacement, alignment specifications)
Brakes:
Front and rear disc brakes, hydraulic system, parking brake (master cylinder, calipers, pads, rotors, bleeding procedures)
Steering:
Power steering system, steering gear, tie rods, steering column (maintenance, overhaul, troubleshooting)
Electrical:
12V DC system, battery, alternator, starter, lighting, gauges, power accessories, wiring diagrams
Body And Chassis:
Body panels, doors, hinges, latches, glass, seals, frame (adjustments, repair techniques)
Interior:
Seats, dashboard, trim panels, HVAC system (disassembly, repair of components)
Heating And Air Conditioning:
HVAC system components, refrigerant, fan motor, controls (service and repair)
Maintenance:
Oil changes, filter replacements, tune-ups, fluid checks, belt adjustments, spark plug replacement
Troubleshooting:
Diagnostic charts, symptom-based troubleshooting for engine, electrical, and mechanical issues
Repair:
Component removal, disassembly, inspection, assembly, and installation for all major systems
Diagnostics:
Diagnostic codes (where applicable for the era), voltage checks, resistance tests, pressure tests
Special Tools:
Identification and usage of BMW-specific and general automotive tools for repairs
Torque Specifications:
Detailed torque values for critical fasteners across all systems
Tightening Sequences:
Specific sequences for tasks like cylinder head installation
Depth:
Comprehensive (from basic maintenance to full engine and transmission rebuilds)
Diagnostic Capability:
Advanced diagnostic procedures for identifying root causes of malfunctions
Rebuild Instructions:
Detailed step-by-step instructions for overhauling major mechanical components
Engine Code 525I:
M30B32 (typically, though some markets may have had M30B28 in 'i' variants for '82)
Configuration:
Inline-6 Cylinder
Displacement 525:
2.8 Liters (2788 cc)
Displacement 525I:
3.2 Liters (3210 cc) or 2.8 Liters (2788 cc) depending on market/specific model code
Horsepower 525:
Approx. 140-145 hp @ 5200 rpm (M30B28)
Horsepower 525I:
Approx. 180-184 hp @ 5500 rpm (M30B32, L-Jetronic)
Torque 525:
Approx. 170-175 lb-ft @ 3500 rpm (M30B28)
Torque 525I:
Approx. 200-210 lb-ft @ 3500 rpm (M30B32, L-Jetronic)
Fuel Delivery:
Bosch L-Jetronic or LE-Jetronic Fuel Injection
Fuel Type:
Unleaded Gasoline (Premium)
Ignition System:
Electronic Ignition (Bosch)
Length:
Approx. 4,725 mm (186 in)
Width:
Approx. 1,700 mm (67 in)
Height:
Approx. 1,415 mm (55.7 in)
Wheelbase:
Approx. 2,795 mm (110 in)
Curb Weight:
Approx. 1,450 - 1,550 kg (3,200 - 3,400 lbs), depending on transmission and options
Oil Change Interval:
Typically every 5,000-7,500 miles or 6-12 months, whichever comes first (consult manual for exact spec)
Spark Plug Replacement:
Intervals vary by plug type, but generally around 30,000-60,000 miles for standard plugs (check manual)
Timing Belt Chain:
M30 engines use a timing chain, which generally lasts the life of the engine, but tensioners and guides require periodic inspection.
Engine Oil Type:
API SG, SF, or higher, viscosity typically 20W-50 or 10W-40 depending on climate (consult manual)
Coolant Type:
Ethylene Glycol based antifreeze/coolant, typically a 50/50 mix with distilled water
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid
Transmission Fluid Manual:
SAE 75W-90 or 80W-90 gear oil (API GL-4 or GL-5)
Transmission Fluid Auto:
Dexron III (or equivalent specification for ZF 4HP22)
Power Steering Fluid:
ATF Dexron II or III (or specific BMW fluid)
Rust Prone Areas:
Wheel arches, rocker panels, door bottoms, trunk lid, sunroof surround
Engine M30:
Head gasket leaks, oil pan gasket leaks, timing chain guide wear, fuel distributor issues (L-Jetronic)
Electrical Common Faults:
Wiring harness degradation, alternator output issues, starter solenoid problems, fuel pump failure
Suspension Wear:
Front control arm bushings, rear subframe bushings, shock absorber failure
Oil Filter Example:
Mann-Filter W940/1, Mahle OC 21, Bosch 0 451 103 001 (Check manual for exact part number compatibility)
Air Filter Example:
Mann-Filter C27133, Mahle LX 39 (Check manual for exact part number compatibility)
Bmw Philosophy:
Bayerische Motoren Werke AG (BMW) founded 1916, renowned for aviation engines, motorcycles, and performance cars
E28 Generation:
The E28 chassis replaced the E12 5 Series and was produced from 1981 to 1988. It was BMW's second generation of the 5 Series executive sedan.
E28 Design:
Designed by Paul Bracq, it featured a more angular and modern aesthetic compared to its predecessor, with improved aerodynamics.
Manufacturing Locations:
Primary production in Dingolfing, Germany, with some assembly in other countries.
