🏷️ Basic Information

Make:

BMW

Model:

325

Sub Model:

325i

Year:

1988

Chassis Code:

E30

Engine Code Primary:

M20B25

👋 Introduction

Positioning:

The BMW 3 Series (E30) of the late 1980s, particularly the 325i, represented a benchmark in sporty, driver-focused luxury sedans and coupes, balancing performance with everyday usability.

Competitors:

Competed directly with models like the Mercedes-Benz 190E, Audi 80/90, and certain performance-oriented Japanese sedans of the era. Known for its superior handling and engine responsiveness compared to many rivals.

Distinguishing Features:

Iconic 'Hofmeister kink' in the C-pillar, excellent weight distribution, responsive handling, strong inline-six engine, robust build quality, and timeless design.

Value Proposition:

This workshop manual is an indispensable tool for owners and technicians aiming to maintain, diagnose, and repair the 1988 BMW 325/325i, ensuring its longevity and optimal performance.

📋 Manual Details

Coverage:

All Models/Engines/Trim/Transmission Types for 1988 BMW 325/325i

Page Count:

Varies by specific manual version, typically 500-1000+ pages for a comprehensive workshop manual.

Type:

Workshop Repair Service Manual

Language:

English

Format:

PDF Download

📖 Manual Coverage

Engine:

Engine mechanical, lubrication, cooling, fuel, exhaust, engine management (ECU/DME), ignition system, emissions control.

Transmission:

Manual and Automatic transmission service, overhaul, fluid specifications, shift linkage, clutch operation (manual).

Drivetrain:

Driveshaft, differential, axles, CV joints.

Suspension:

Front and rear suspension components, struts, shocks, springs, control arms, sway bars, bushings, alignment specifications.

Brakes:

Front and rear brake systems (disc brakes), brake calipers, rotors, pads, master cylinder, brake lines, ABS (if equipped), bleeding procedures.

Steering:

Power steering system, steering rack, tie rods, steering column, alignment specifications.

Electrical:

Battery, starting system, charging system (alternator), lighting system, ignition system, fuses, relays, wiring diagrams, instrument cluster, power accessories.

Body And Chassis:

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

HVAC:

Heating, ventilation, and air conditioning system service, refrigerant, components, operation.

Maintenance:

Scheduled maintenance, oil changes, filter replacements, tune-ups, fluid checks and changes, belt replacement, spark plug service.

Troubleshooting:

Diagnostic procedures for common and uncommon issues, symptom-based troubleshooting guides, diagnostic trouble codes (DTCs) interpretation if applicable to the era.

Repair:

Component removal, disassembly, repair, reassembly, and installation for all major vehicle systems.

Diagnostics:

Engine performance diagnostics, electrical system testing, fuel system diagnostics, emissions system checks.

Specifications:

Torque specifications for critical fasteners, measurement specifications, alignment angles, fluid capacities and types.

Depth:

Comprehensive, from basic preventative maintenance to complete engine and transmission overhauls. Includes detailed diagnostic procedures and wiring diagrams.

📊 Manual Specifications

File Format:

PDF

Searchability:

Typically text-searchable for quick information retrieval.

Quality:

Digital PDF, allowing for clear display and printing of diagrams and text.

Binding:

N/A (Digital Download)

Paper Type:

N/A (Digital Download)

⚙️ Engine Specifications

Engine Name:

BMW M20B25

Engine Type:

Naturally Aspirated Inline-6 Cylinder

Displacement:

2494 cc (2.5 Liters)

Bore X Stroke:

84 mm x 75 mm

Compression Ratio:

8.8:1

Horsepower:

168 hp @ 5800 rpm (approx.)

Torque:

220 Nm (162 lb-ft) @ 4300 rpm (approx.)

Fuel Delivery:

Bosch Motronic fuel injection (early version)

Fuel Type:

Unleaded Gasoline (91 Octane or higher recommended)

ECU:

Bosch Motronic ML1.3

🔧 Transmission

Type:

Getrag 260 5-speed manual transmission

Type:

ZF 4HP22 4-speed automatic transmission

Manual Clutch:

Hydraulically actuated single-plate dry clutch

Manual Fluid:

API GL-4 SAE 75W-90 or 80W-90 gear oil. Capacity approx. 1.5-1.7 liters.

Automatic Fluid:

Dexron-III (or equivalent ATF). Capacity approx. 1.5-2.0 liters for torque converter drain.

📐 Dimensions

Wheelbase:

2565 mm (101 inches)

Length:

4325 mm (170.3 inches)

Width:

1674 mm (65.9 inches)

Height:

1380 mm (54.3 inches)

Curb Weight:

Approx. 1250-1350 kg (2755-2976 lbs), depending on body style and options.

Gross Vehicle Weight Rating:

Approx. 1700 kg

Wheel Bolt Pattern:

5x120 mm

Tire Size Standard:

195/65R14 or 205/55R14 (common fitments)

Wheel Size Standard:

14x6.0 inch or 14x6.5 inch alloy wheels

🛡️ Safety Features

Crash Test Results:

As a vehicle from 1988, official standardized crash test ratings (like NHTSA/IIHS) are not directly comparable to modern standards. However, the E30 chassis was engineered with a focus on structural integrity for its time.

ABS:

Anti-lock Braking System (ABS) was an optional feature on some 1988 models, particularly the 325i.

Airbags:

Driver-side airbag was typically not standard, often an option on later E30 models, potentially available for 1988.

Seatbelts:

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

Rollover Protection:

Reinforced A-pillars and B-pillars, along with integrated roll bars in convertible models (if applicable).

💡 Technology Features

Audio System:

Factory-installed AM/FM stereo cassette player, often with premium sound system options (e.g., amplifier, additional speakers). Aftermarket head units are common upgrades.

Navigation:

No factory navigation system available for this model year.

Cruise Control:

Optional feature on most models.

Traction Control:

Not typically available on 1988 models. ABS was the primary electronic driver aid.

Power Windows:

Standard on 325i, often optional on other models in the range. Power sunroof also a common option.

Climate Control:

Manual climate control with A/C was standard or optional. Automatic climate control was a higher-end option, less common on the base 325i.

🔧 Maintenance

Oil Change:

Every 5,000-7,500 miles or 6-12 months. Check manual for specific oil type and capacity.

Air Filter Replacement:

Every 15,000-30,000 miles or as needed based on operating conditions.

Spark Plug Replacement:

Every 30,000-60,000 miles, depending on spark plug type (copper vs. platinum).

Timing Belt Replacement:

Crucial for the M20 engine as it is an interference engine. Recommended replacement every 50,000-75,000 miles or 5-7 years. The manual will detail the procedure and recommended belt kits.

Engine Oil:

API SG or higher, SAE 15W-40 or 20W-50. Check manual for specific BMW recommendations. Capacity approx. 4.25 liters (with filter).

Coolant:

BMW Blue Antifreeze or equivalent ethylene glycol-based coolant mixed 50/50 with distilled water. Capacity approx. 8.0 liters.

Brake Fluid:

DOT 3 or DOT 4. Flush and replace every 2 years.

Power Steering Fluid:

Dexron-III ATF or specific BMW power steering fluid. Check manual for exact specification. Capacity approx. 1.0-1.2 liters.

Engine Oil Leaks:

Common leaks from valve cover gasket, oil pan gasket, and front crank seal (especially during high mileage).

Cooling System:

Degradation of plastic coolant hoses, radiator tanks, and water pump. Thermostat housing leaks can also occur. Regular inspection and replacement are vital.

Suspension Bushings:

Wear in control arm bushings, sway bar bushings, and subframe bushings leads to sloppy handling and noise. The manual provides replacement procedures.

Electrical Gremlins:

Corrosion in connectors, aging wiring harnesses, and failing relays (e.g., fuel pump relay, motive power relay) can cause intermittent electrical issues. Wiring diagrams in the manual are essential.

Fuel Injectors:

Clogging or failure of Bosch fuel injectors can lead to misfires or poor performance. The manual covers testing and replacement.

Dashboard Lighting:

Failure of instrument cluster illumination or indicator lights due to worn bulbs or failing PCB traces.

📚 Vehicle History

Bmw Philosophy:

BMW's heritage of 'The Ultimate Driving Machine' is deeply embedded in the E30 generation, emphasizing engineering excellence, performance, and driver engagement.

E30 Introduction:

The E30 generation was introduced in 1982, replacing the E21. The 325/325e/325i variants became prominent in the mid-1980s, offering enhanced performance over the 318i and 320i models.

E30 1988 Updates:

The 1988 model year falls within the mid-to-late lifecycle of the E30. Updates for this period typically involved minor cosmetic refinements, interior enhancements, and potential updates to the engine management systems for emissions compliance and efficiency.

Production Years:

E30 production ran from 1982 to 1994 (with final models in some markets being 1991-1994 for convertible variants).

Body Styles:

Available as a 2-door sedan, 4-door sedan, convertible, and a rare touring (wagon) variant. The 325i was primarily offered as a 2-door and 4-door sedan, with convertible versions also common.

🏆 Awards & Recognition

Automotive Press:

The E30 3 Series consistently received praise from automotive journalists for its driving dynamics, build quality, and performance throughout its production run.

Long Term Value:

Despite its age, well-maintained E30s are highly sought after by enthusiasts and retain significant value due to their classic status and driving purity.

Historical Significance:

The E30 is widely considered one of BMW's most iconic and influential models, cementing the 3 Series' reputation as a class leader in sport sedans.