🏷️ Basic Information

Make:

BMW

Model:

325i

Chassis Code:

E30

Generation Name:

First Generation E30

Engine Code Primary:

M20B25

Engine Codes Other Applicable:

M20B27 (for some overlap in the E30 platform covered by comprehensive manuals of this era)

👋 Introduction

Historical Positioning:

The BMW 325i (E30) was positioned as a premium sports sedan and coupe, known for its balanced handling, spirited performance, and driver-focused experience, competing against rivals like the Mercedes-Benz 190E and Audi 80/90.

Strengths Vs Competitors:

Superior driving dynamics, more powerful inline-six engine compared to base models of some competitors, and a more sporting image.

Defining Characteristics:

Iconic BMW styling, rear-wheel-drive platform, legendary M20 inline-six engine, excellent chassis balance, and a reputation for durability and driver engagement.

Target Audience And Benefit:

Essential for owners and independent mechanics seeking to maintain, diagnose, and repair the BMW 325i (E30) to manufacturer specifications, ensuring longevity and optimal performance. Provides professional-level insights for enthusiasts and professionals alike.

📋 Manual Details

Covered Models:

BMW 325i (E30 chassis)

Covered Years:

1987, 1988, 1989, 1990, 1991

Coverage Scope:

All models and variants of the 325i within the E30 platform for the specified years.

Estimated Page Count:

Extensive, likely exceeding 1000 pages in compiled digital format. Specific page count varies by publisher and completeness of the source.

Type:

Service and Repair Workshop Manual

Language:

English

Format:

PDF

📖 Manual Coverage

Powertrain:

Engine (M20B25), Fuel System (Bosch LE-Jetronic/Motronic), Ignition System, Exhaust System.

Transmission Drivetrain:

Manual Transmissions (Getrag 260), Automatic Transmissions (ZF 4HP22), Driveline Components, Clutch.

Suspension Steering:

Front Suspension (MacPherson Struts), Rear Suspension (Semi-Trailing Arms), Steering System (Power Assisted Rack and Pinion).

Brakes:

Front Disc Brakes, Rear Disc Brakes, ABS (Anti-lock Braking System).

Electrical Electronics:

Engine Control Unit (ECU), Lighting System, Instrumentation, Battery, Charging System, Starter, Fuses and Relays, Body Electrics.

Body Chassis:

Body Panels, Doors, Hood, Trunk, Glass, Interior Trim, Chassis Components.

Routine Maintenance:

Oil Changes, Filter Replacements (Oil, Air, Fuel), Spark Plug Service, Fluid Checks and Top-ups, Belt Inspection and Replacement.

Engine Repair:

Top End Rebuild (Cylinder Head), Bottom End Rebuild (Pistons, Connecting Rods, Crankshaft), Timing Belt/Chain Replacement, Fuel Injector Servicing, Ignition System Diagnosis and Repair.

Transmission Service:

Clutch Replacement, Transmission Fluid and Filter Service, Gearbox Overhaul, Torque Converter Replacement (Automatic).

Brake System Repair:

Brake Pad and Rotor Replacement, Caliper Rebuild, Brake Line Replacement, ABS Component Diagnosis and Repair.

Suspension Steering Repair:

Shock Absorber and Strut Replacement, Bushing Replacement, Ball Joint Replacement, Tie Rod End Replacement, Steering Rack Service.

Electrical Diagnosis:

Wiring Diagrams, Troubleshooting Flowcharts, Component Testing (ECU, Sensors, Actuators), Battery and Charging System Testing.

Body Repair:

Panel Replacement, Dent Repair, Rust Mitigation, Glass Replacement, Door and Window Mechanism Adjustment.

Troubleshooting:

Diagnostic Codes (if applicable for the era), Symptom-Based Troubleshooting Guides, Common Problems and Solutions.

Depth:

Comprehensive, covering everything from routine maintenance and fluid changes to complete engine and transmission rebuilds, detailed electrical diagnostics, and bodywork repairs. It mirrors the information used by certified BMW technicians.

📊 Manual Specifications

File Type:

PDF

Searchability:

Typically searchable text within the PDF, allowing for quick access to specific terms and procedures.

Printability:

Designed to be printable, allowing users to create hard copies of specific sections or the entire manual.

Binding For Printed Version:

N/A (Digital Format - PDF). If a physical version were produced, professional binding like perfect binding or spiral binding would be expected for workshop use.

Paper Type For Printed Version:

N/A (Digital Format - PDF). Original manuals were often printed on high-quality, durable paper suitable for workshop environments.

⚙️ Engine Specifications

Engine Type:

Naturally Aspirated Inline 6-Cylinder

Displacement:

2494 cc (2.5 Liters)

Bore X Stroke:

84.0 mm x 75.0 mm

Compression Ratio:

8.5:1 or 9.4:1 (depending on specific market and fuel requirements)

Horsepower Peak:

Approx. 168 hp (125 kW) at 5800 rpm (DIN)

Torque Peak:

Approx. 164 lb-ft (222 Nm) at 4300 rpm (DIN)

Fuel Injection Type:

Bosch Motronic (M1.3 or M1.7 depending on the exact model year and market, featuring Lambda control)

Fuel Type:

Unleaded Premium Gasoline (91 Octane or higher recommended)

Ignition Type:

Distributorless Ignition System (DIS) or Distributor-based ignition, managed by Motronic ECU.

🔧 Transmission

Transmission Type Standard:

5-Speed Manual (Getrag 260/5)

Transmission Type Optional:

4-Speed Automatic (ZF 4HP22)

Clutch Type Manual:

Hydraulically actuated single-plate dry clutch.

Final Drive Ratio:

Typically 3.25:1 for manual, 3.46:1 for automatic (may vary by market/options)

📐 Dimensions

Wheelbase:

2570 mm (101.2 in)

Length:

4325 mm (170.3 in)

Width:

1675 mm (65.9 in)

Height:

1380 mm (54.3 in)

Curb Weight:

Approx. 1270-1350 kg (2800-2975 lbs) depending on body style and equipment.

Gross Vehicle Weight Rating:

Approx. 1700-1750 kg (3750-3860 lbs)

Towing Capacity:

Not officially recommended for towing by BMW.

🛡️ Safety Features

Crash Test History:

E30 models from this era predated standardized modern crash testing regimes like NCAP. However, BMW's reputation for build quality suggests robust structural integrity for its time.

Braking:

Front Ventilated Disc, Rear Disc. Optional ABS (Anti-lock Braking System).

Traction Control:

Not commonly available on 325i models of this generation.

Airbags:

Driver's airbag became standard on later E30 models, likely included in the 1987-1991 range depending on market and specific build date. Passenger airbag was generally not offered.

Seatbelts:

Three-point inertia-reel seatbelts for front and rear occupants.

Chassis Design:

Crumple zones front and rear, reinforced passenger cell.

💡 Technology Features

Audio System:

Original systems typically featured AM/FM radio with cassette player. Upgraded units with CD players were available as dealer options or aftermarket additions.

Navigation:

No factory navigation systems were available for this generation E30.

ABS:

Optional Anti-lock Braking System (ABS) was available, typically on later models and higher trims.

Cruise Control:

Available as an option on many 325i models.

Limited Slip Differential:

Optional limited-slip differential (LSD) was a popular factory option, significantly enhancing traction and performance, especially in spirited driving and adverse conditions.

Original Connectivity:

Limited to basic car radio features. No Bluetooth, USB, or smartphone integration.

🔧 Maintenance

Oil Change Interval:

Typically every 7,500 - 10,000 miles (12,000 - 15,000 km) or 12 months, whichever comes first, using synthetic oil. Check manual for precise recommendations.

Air Filter Replacement:

Every 15,000 - 30,000 miles (24,000 - 48,000 km) or as needed based on operating conditions.

Spark Plug Replacement:

Depending on plug type, intervals can range from 30,000 to 60,000 miles (48,000 to 96,000 km).

Timing Belt Replacement:

The M20 engine uses a timing belt. Replacement is critical, typically recommended every 40,000 - 60,000 miles (64,000 - 96,000 km) or 4-5 years due to potential for catastrophic engine damage if it breaks. The manual will specify the exact interval.

Engine Oil Type:

API SG/SH rated, SAE 15W-40 or 10W-40 synthetic or semi-synthetic oil is commonly recommended. Consult the manual for exact specifications and viscosity grades suitable for climate.

Coolant Type:

Ethylene glycol-based coolant, typically a 50/50 mix with distilled water. BMW recommends specific formulations, or a quality Asian Green/Blue coolant.

Transmission Fluid Manual:

GL-4 rated manual transmission fluid. Specific BMW part numbers or equivalent should be consulted.

Transmission Fluid Automatic:

Dexron III (or equivalent) ATF. Consult the manual for precise specifications and change intervals.

Brake Fluid Type:

DOT 4 specification brake fluid.

Engine:

Cooling system (radiator, water pump, thermostat, hoses), head gasket leaks, timing belt failure (if not replaced per schedule), fuel distributor issues, idle control valve problems, oil leaks from the front timing cover seal and oil pan.

Suspension:

Worn rear trailing arm bushings (very common), front control arm bushings, ball joints, and shock absorbers. Sagging rear springs.

Electrical:

Corrosion in fuse box and connectors, failing instrument cluster capacitors, alternator voltage regulator issues, starter solenoid problems, door lock actuators.

Body:

Rust, particularly around wheel wells, rocker panels, battery tray, and sunroof drains. Headliner sagging.

📚 Vehicle History

Bmw Legacy:

BMW has a long-standing heritage of building driver-focused, performance-oriented vehicles, with the 3 Series lineage being central to its identity since the mid-1970s.

E30 Introduction:

The E30 generation of the 3 Series was introduced in 1982 as the successor to the highly successful E21. It evolved through various body styles (2-door sedan, 4-door sedan, convertible, touring) and engine options.

E30 325I Introduction:

The 325i designation was introduced later in the E30 lifecycle, offering the more powerful M20B25 engine, and was a significant upgrade over earlier 323i and 325e models.

Production Period E30:

1982–1994 (globally, with variations by market and body style).

Production Period 325I E30:

The 325i model specifically was produced from 1985 through the end of the E30 generation in 1991 in most markets.

Manufacturing Locations:

Primarily Germany, with some assembly in South Africa and other international locations.

🏆 Awards & Recognition

Automotive Press Awards:

While specific awards for the 1987-1991 325i are less documented than modern vehicles, the E30 platform and the 3 Series in general consistently received praise from automotive publications for their driving dynamics, build quality, and performance.

Classic Car Status:

The E30 325i is widely regarded as a modern classic and a future collectible, often appearing on 'best of' lists for affordable performance cars and iconic BMWs.