🏷️ Basic Information

Make:

BMW

Model:

750iL

Year:

1988

Chassis Code:

E32

👋 Introduction

Positioning:

The BMW 750iL (E32) was BMW's flagship luxury sedan in 1988, representing the pinnacle of automotive engineering, comfort, and performance for its era. Positioned against other high-end European luxury sedans.

Competitors:

Mercedes-Benz S-Class (W126), Jaguar XJ, Mercedes-Benz SEC Coupe.

Defining Features:

The iconic M70 5.0L V12 engine, long-wheelbase 'L' variant offering enhanced rear passenger space, advanced (for its time) electronic systems including ABS and optional traction control, luxurious interior appointments, and sophisticated ride quality.

📋 Manual Details

Engines Covered:

M70B50 (5.0L V12)

Transmissions Covered:

4-speed automatic (optional), 5-speed manual (rare/non-US market)

Estimated Page Count:

1000+

Manual Type:

Factory Authorized Service and Repair Workshop Manual

Language:

English

Format:

Digital (PDF)

📖 Manual Coverage

Engine Mechanical:

Full engine overhaul, cylinder head, block, pistons, crankshaft, camshafts, timing, lubrication, cooling system.

Engine Management:

Bosch Motronic M1.2 DME, ignition system, fuel injection, air intake, exhaust system, emissions control.

Transmission:

Automatic transmission overhaul (e.g., ZF 4HP-24), manual transmission (if applicable), clutch, driveshafts, differentials.

Brakes:

Hydraulic system, ABS (Anti-lock Braking System) diagnostics and repair, brake discs, pads, calipers, lines, parking brake.

Suspension And Steering:

Front and rear suspension components (MacPherson struts, multi-link rear), power steering system, steering rack, alignment specifications.

Electrical System:

Complete wiring diagrams, fuse/relay locations, battery, charging system, starter, lighting, power windows, seats, mirrors, central locking, OBC (On-Board Computer).

Body And Chassis:

Body panel removal and installation, doors, hood, trunk, bumpers, interior trim, sound deadening, rust prevention.

HVAC:

Air conditioning system diagnostics and repair, heater core, blower motor, climate control unit, refrigerant handling.

Routine Maintenance:

Oil changes, filter replacements, spark plug replacement, fluid checks and top-offs, belt inspections and replacement.

Troubleshooting Diagnostics:

Systematic fault finding, diagnostic codes, component testing, wiring harness tracing.

Major Repairs:

Engine rebuilds, transmission overhauls, suspension component replacement, electrical system repairs.

Component Rebuilds:

Detailed instructions for rebuilding specific components like alternators, starters, fuel injectors, etc.

Alignment Specifications:

Wheel alignment angles, torque specifications for critical fasteners.

Depth:

Comprehensive; suitable for professional mechanics and advanced DIY enthusiasts. Covers everything from basic maintenance to complete vehicle overhauls and complex diagnostics.

📊 Manual Specifications

File Format Details:

Searchable PDF with high-resolution scanned pages, often includes indexed sections for easy navigation.

Scan Resolution:

High resolution ensuring clarity of diagrams, text, and images.

Binding Type:

N/A (Digital Format)

Paper Type:

N/A (Digital Format)

⚙️ Engine Specifications

Engine Code:

M70B50

Engine Type:

V12, SOHC (Single Overhead Cam)

Displacement:

4988 cc (5.0 Liters)

Bore X Stroke:

84.0 mm x 90.0 mm

Compression Ratio:

8.8:1

Valvetrain:

24 valves (2 per cylinder)

Horsepower:

295 hp @ 5200 rpm (SAE Net)

Torque:

317 lb-ft @ 4100 rpm (SAE Net)

Fuel Injection:

Bosch Motronic M1.2 Electronic Fuel Injection (sequential for each bank)

Fuel Type:

Premium Unleaded Gasoline (91 octane or higher)

Coolant Capacity:

Approximately 13.7 Liters (14.5 US Quarts)

Oil Capacity:

Approximately 7.5 Liters (7.9 US Quarts) with filter change

Recommended Oil Viscosity:

15W-40 or 20W-50 (depending on climate, consult manual)

🔧 Transmission

Transmission Type:

4-speed automatic transmission (ZF 4HP-24)

Optional Transmission:

5-speed manual transmission (rare for 750iL, more common in other E32 variants)

Automatic Transmission Features:

Electronic control, torque converter lock-up, sport and economy modes.

Automatic Transmission Fluid Type:

Dexron III or equivalent (BMW fluid P/N 81 22 9 400 275)

Automatic Transmission Fluid Capacity:

Approximately 7.5 Liters (7.9 US Quarts) for a full drain and fill.

📐 Dimensions

Wheelbase:

3070 mm (120.9 inches)

Length:

5024 mm (197.8 inches)

Width:

1800 mm (70.9 inches)

Height:

1400 mm (55.1 inches)

Curb Weight:

Approximately 1900-2000 kg (4189-4409 lbs)

Gross Vehicle Weight Rating:

Approximately 2450 kg (5401 lbs)

Wheelbase Pattern:

5x120 mm

Wheel Size:

Typically 15-inch alloy wheels (e.g., BBS) or optional 16-inch.

Standard Tire Size:

225/60VR15 or 225/55VR15

🛡️ Safety Features

Safety Ratings:

Specific crash test ratings for this era are not as standardized as modern vehicles. Focus on built-in safety features.

Active Safety:

Anti-lock Braking System (ABS), optional Traction Control System (ASC).

Passive Safety:

Reinforced passenger cell, crumple zones, driver and passenger airbags (standard on later E32 models, potentially optional on early '88), three-point seatbelts with pretensioners, safety steering column.

💡 Technology Features

Infotainment System:

Basic AM/FM stereo with cassette player, optional CD changer. Analog climate control with integrated OBC.

Driver Assistance Features:

ABS, optional ASC (Automatic Stability Control). Cruise control.

Connectivity Features:

No modern connectivity features like Bluetooth or USB. Basic car phone integration might have been an option.

Convenience Features:

Power adjustable front and rear seats (often with memory for driver), heated seats, power windows, power mirrors, central locking, sunroof, self-leveling rear suspension (optional), trip computer (OBC).

🔧 Maintenance

Oil Change Interval:

Typically every 15,000 km (9,300 miles) or 12 months, but often recommended more frequently by enthusiasts (e.g., 5,000-7,500 miles or 6 months) due to the V12's complexity and heat.

Spark Plug Replacement Interval:

Approximately every 40,000-50,000 km (25,000-31,000 miles). The M70 uses 12 spark plugs (6 per bank).

Coolant Flush Interval:

Every 2-3 years or as recommended by BMW.

Brake Fluid Type:

DOT 4

Power Steering Fluid Type:

BMW Power Steering Fluid (P/N 81 22 9 407 253) or ATF Dexron III equivalent.

Coolant Type:

Ethylene glycol-based antifreeze (BMW Coolant P/N 81 22 9 407 454)

Engine Common Issues:

Coil pack failures (each bank has its own), distributor issues, idle control valve problems, VANOS seals (later models), fuel distributor issues, oil leaks from V-seals.

Electrical Common Issues:

Water ingress into the DME and fuse box, aging wiring harnesses, failing ABS sensors, OBC display fade.

Suspension Common Issues:

Worn control arm bushings, failing struts, rear self-leveling suspension (if equipped) issues.

HVAC Common Issues:

Leaking heater cores, failing blower motors, refrigerant leaks, climate control unit malfunctions.

📚 Vehicle History

Heritage:

BMW's reputation for building driver-focused luxury sedans with strong performance credentials.

E32 Generation:

The E32 platform replaced the E23 7 Series. The 750iL was the flagship model of the E32 generation, introduced in 1987, and was distinguished by its V12 engine.

Production Period:

1986-1994 (E32 generation). The 750iL specifically from 1987 onwards.

Manufacturing Location:

Dingolfing, Germany.

🏆 Awards & Recognition

Automotive Awards:

The E32 7 Series was generally well-received for its engineering and luxury, though specific awards for the '88 750iL may not be widely documented in the same way as modern vehicles. Its V12 engine was a significant technical achievement.

Performance Reviews:

Praised for its smooth V12 power delivery, refined ride, and quiet cabin. Criticisms often centered on its complexity and the cost of maintenance.