🏷️ Basic Information

Make:

BMW

Model:

3-Series

Model Variant:

325i

Chassis Code:

E30

Model Years Covered:

1987-1991

Engine Code Common:

M20B25

👋 Introduction

E30 Generation Significance:

The E30 chassis is a highly regarded generation of the BMW 3-Series, known for its sporty handling, reliable engineering, and classic design. The 325i represented the top-tier performance model for much of its run.

Era Competitors:

Competed against vehicles like the Mercedes-Benz 190E, Audi 80/90, Alfa Romeo 75, and sporty coupes from brands like Ford (Sierra XR4i) and Opel (Kadett GSi).

Driving Dynamics:

Renowned for its balanced chassis, RWD layout, and engaging driving experience.

Build Quality:

Typical BMW build quality for the era, emphasizing durability and driver focus.

Target User Benefit:

Provides the detailed technical information necessary for accurate diagnosis, repair, and preventative maintenance, empowering owners and technicians to maintain the E30 325i to factory standards.

📋 Manual Details

Manual Type:

Workshop Service Repair Manual

Language:

English

Format:

Downloadable Digital File (PDF)

Intended Audience:

Professional Technicians and Experienced DIY Enthusiasts

Comprehensiveness:

Comprehensive coverage for all major systems and components

📖 Manual Coverage

Engine Mechanical:

Engine assembly, disassembly, overhaul, cylinder head, block, crankshaft, pistons, connecting rods, lubrication system, cooling system.

Engine Management:

Bosch Motronic fuel injection and ignition systems (ME/ME-S/ME-E control), sensor testing, actuator diagnostics, emissions control.

Transmission:

Getrag 260 5-speed manual transmission overhaul, clutch system, driveline, driveshaft, rear axle assembly.

Brakes:

Front and rear disc brake systems, ABS (Anti-lock Braking System) diagnostics and repair, hydraulic circuits, master cylinder, calipers.

Suspension:

Front MacPherson struts, rear semi-trailing arms, shock absorbers, springs, bushings, alignment specifications.

Steering:

Power steering system, steering rack, tie rods, steering column, steering knuckle.

Electrical System:

Battery, alternator, starter motor, lighting systems, instrumentation, wiring diagrams, fuse box locations, relay functions.

Body And Chassis:

Body panel removal and installation, door mechanisms, window regulators, sunroof operation, interior trim, chassis components.

Heating Ventilation Air Conditioning:

HVAC system operation, refrigerant handling (R12 for this era), blower motor, evaporator, condenser, heater core.

Maintenance:

Scheduled maintenance, oil changes, filter replacements, spark plug replacement, tune-ups, brake fluid flush, coolant flush.

Troubleshooting:

Systematic diagnostic procedures for common and uncommon issues, diagnostic trouble codes (DTCs) where applicable, component testing.

Repair:

Step-by-step instructions for component removal, repair, and reinstallation across all covered systems.

Diagnostics:

Detailed diagnostic flowcharts and procedures for identifying faults, including electrical and mechanical diagnosis.

Specifications:

Torque specifications, clearances, fluid capacities, alignment angles, and other critical data.

Engine Rebuild:

Full engine rebuild procedures, including cylinder honing, piston ring installation, bearing clearances, valve seating, and timing belt replacement.

Transmission Overhaul:

Detailed steps for disassembling, inspecting, and reassembling the Getrag 260 manual transmission.

Electrical Diagnostics:

In-depth electrical troubleshooting using wiring diagrams, including component resistance and voltage checks.

ABS System:

Specific diagnostic procedures and repair steps for the ABS system, including sensor and hydraulic unit servicing.

Bodywork Repair:

Procedures for common body repairs, panel alignment, and rust prevention/repair.

📊 Manual Specifications

File Type:

PDF (Portable Document Format)

Searchability:

Searchable text for quick information retrieval.

Printability:

Printable pages for workshop use.

Resolution:

High resolution for clear diagrams and illustrations.

Illustrations:

Detailed diagrams, schematics, and photographic illustrations.

Text Clarity:

Clear, concise technical language.

Binding:

N/A (Digital Download)

Paper:

N/A (Digital Download)

Estimated Pages:

Est. 1000+ pages (typical for comprehensive workshop manuals of this era)

⚙️ Engine Specifications

Engine Type:

Naturally Aspirated Inline-6 Cylinder

Engine Code:

M20B25

Displacement:

2494 cc (2.5 Liters)

Horsepower Peak:

171 hp @ 5800 rpm (for most 1987-1991 models)

Torque Peak:

164 lb-ft (225 Nm) @ 4300 rpm (for most 1987-1991 models)

Fuel Delivery:

Bosch Motronic Electronic Fuel Injection (EFI)

Fuel Type:

Unleaded Gasoline (Premium Recommended)

Bore X Stroke:

84.0 mm x 75.0 mm

Compression Ratio:

8.8:1

Ignition Type:

Electronic Ignition with Knock Sensor

🔧 Transmission

Transmission Type:

Getrag 260 5-Speed Manual Transmission

Automatic Transmission Option:

ZF 4HP22 4-Speed Automatic Transmission

Clutch Type:

Hydraulically Actuated Single Dry Plate Clutch

Driveshaft:

One-piece driveshaft with universal joints

Rear Axle:

Limited Slip Differential (LSD) often an option or standard on some 325i models.

📐 Dimensions

Length:

Approx. 170.5 in (4330 mm)

Width:

Approx. 66.9 in (1700 mm)

Height:

Approx. 55.1 in (1400 mm)

Wheelbase:

Approx. 101.2 in (2570 mm)

Curb Weight:

Approx. 2800-3000 lbs (1270-1360 kg), varies by options

🛡️ Safety Features

Crash Test Data:

Refer to NHTSA or IIHS archives for specific crash test results from this era; generally considered robust for its time. E30s were known for their structural integrity.

ABS:

Anti-lock Braking System (standard on later models, optional earlier)

Limited Slip Differential:

Optional on 325i for improved traction.

Seat Belts:

Three-point inertia-reel seat belts front and rear.

Headrests:

Front and rear headrests.

Body Structure:

Reinforced passenger safety cell, crumple zones.

💡 Technology Features

Audio System:

Factory fitted AM/FM cassette players, often with premium speaker options. Analog controls for tuning, volume, and tone.

Climate Control:

Manual or optional automatic climate control systems.

Cruise Control:

Optional electronic cruise control system.

Early Features:

Limited by modern standards; focus was on mechanical and driving engagement rather than extensive digital integration.

🔧 Maintenance

Oil Change Interval:

Every 7,500 miles (12,000 km) or annually, whichever comes first, with high-quality synthetic oil.

Air Filter Replacement:

Every 15,000 miles (24,000 km) or as needed based on conditions.

Spark Plug Replacement:

Every 30,000 miles (48,000 km) for platinum plugs, or 15,000 miles (24,000 km) for standard plugs. Manual will specify correct type.

Coolant Flush:

Every 2-3 years or 30,000 miles (48,000 km).

Timing Belt Replacement:

Crucial. Every 50,000-60,000 miles (80,000-96,000 km) or 4-5 years. Failure causes catastrophic engine damage due to interference design.

Engine Oil:

BMW recommends 5W-30 or 10W-40 synthetic oil. Manual will detail API service classification.

Coolant:

BMW Blue Coolant (G48) or equivalent ethylene glycol-based coolant with corrosion inhibitors. 50/50 mix with distilled water.

Brake Fluid:

DOT 4 Low Viscosity (LV) or DOT 4.

Transmission Fluid Manual:

API GL-4 SAE 75W-90 or 80W-90 gear oil.

Transmission Fluid Automatic:

Dexron III or equivalent ATF (refer to specific BMW manual for exact spec).

Power Steering Fluid:

Pentosin CHF 11S or equivalent hydraulic fluid.

Cooling System:

Plastic coolant expansion tanks and hose failures are common. Thermostat housing leaks also occur.

Fuel Delivery:

Fuel pump, O-rings, and injector seals can degrade over time, leading to leaks or poor running conditions.

Suspension Wear:

Worn control arm bushings, ball joints, and trailing arm bushings are common due to age and mileage, impacting handling and alignment.

Electrical Gremlins:

Degradation of wiring insulation, particularly in the engine bay, can lead to intermittent electrical faults. Cracked dashboard wiring looms are also known.

Rust Prone Areas:

Wheel arches, rocker panels, jacking points, and rear window surrounds are susceptible to rust, especially in areas with salt exposure.

📚 Vehicle History

Bmw Legacy:

BMW's reputation for engineering excellence, sporty driving dynamics, and driver-focused interiors is well-established by the time of the E30 generation.

E30 Development:

The E30 was introduced in 1982 as a successor to the E21. The 325i variant, powered by the M20 inline-six engine, was introduced in 1985 and became a benchmark sports sedan and coupe.

Production Years Global:

1982-1994 (E30 chassis globally, with facelifted models into the mid-90s)

Manufacturing Locations:

Primarily Germany (Munich, Dingolfing), with some assembly in other international locations.

Facelift:

The 1987-1991 models represent the late-production phase of the E30, often featuring revised aerodynamics (i.e., larger plastic bumpers, revised grilles and trim) and interior updates compared to early E30s.

🏆 Awards & Recognition

Car And Driver 10Best:

The E30 3-Series, including the 325i, was a frequent recipient of Car and Driver's '10Best' lists during its production run, highlighting its outstanding driving dynamics and overall excellence.

Automotive Journalism Praise:

Consistently praised by automotive journalists for its handling, performance, and build quality, cementing its status as a benchmark in the sports sedan segment.

Historical Significance:

Recognized by many automotive enthusiasts and publications as one of BMW's most iconic and best-driving generations.