Segment:
Full-Size Luxury Sedan
Target Audience:
Owners seeking to maintain, repair, or restore their 1991 BMW 750iL, including DIY enthusiasts and independent repair shops.
Competitors:
Mercedes-Benz S-Class (W140), Lexus LS 400, Jaguar XJ Series.
Vehicle Features:
V12 engine, long wheelbase, advanced technology for its era, luxurious interior, refined driving dynamics.
Value Proposition:
Provides critical, detailed information essential for preserving and maintaining the complex systems of the 1991 BMW 750iL, often unavailable in generic repair guides.
Primary Coverage:
Full Service, Repair, Rebuilding, Refurbishment, Restoration
Diagnostic Coverage:
Extensive Diagnostic Procedures
Type:
Full Service & Repair Manual
Powertrain:
Engine, Fuel System, Exhaust System, Cooling System, Lubrication System, Ignition System, Transmission (Automatic), Drivetrain
Chassis:
Suspension (Front & Rear), Steering System, Brake System (Front & Rear, ABS), Wheels & Tires
Electrical:
Engine Management, Body Electronics, Lighting, Instrumentation, HVAC Controls, Power Accessories (Windows, Seats, Mirrors, Sunroof), Battery, Charging System, Starter
Body:
Body Panels, Doors, Hood, Trunk, Bumpers, Glass, Interior Trim, Seats
Maintenance:
Scheduled Maintenance, Oil Changes, Filter Replacements, Spark Plug Replacement, Belt Replacement
Repair:
Engine Overhaul, Transmission Repair, Suspension Component Replacement, Brake System Overhaul, Electrical Component Diagnosis and Repair, Body Panel Repair
Troubleshooting:
Diagnostic Flowcharts, Common Fault Finding, Error Code Interpretation
Rebuilding:
Engine Rebuild Specifications, Transmission Rebuild Procedures
Depth:
Comprehensive, from basic maintenance to complete engine and transmission rebuilds, including detailed electrical schematics and diagnostic procedures.
Engine Type:
V12, SOHC, 48 valves
Displacement:
4988 cc (5.0 Liters)
Bore X Stroke:
84.0 mm x 90.0 mm
Horsepower:
300 hp @ 5200 rpm
Torque:
332 lb-ft @ 4100 rpm
Fuel Delivery:
Bosch Motronic M1.2
Fuel Type:
Unleaded Premium Gasoline (91+ Octane)
Oil Capacity:
7.5 Liters (approx. 8 US Quarts)
Recommended Oil Viscosity:
SAE 5W-30 or 5W-40
Coolant Capacity:
12.0 Liters (approx. 12.7 US Quarts)
Coolant Type:
BMW Blue Coolant (Ethylene Glycol based)
Transmission Type:
4-speed Automatic
Transmission Model:
ZF 4HP24
Optional Transmission:
N/A (Only Automatic Offered)
Transmission Modes:
Economy (E) and Sport (S) modes
Transmission Fluid Capacity:
4.0 Liters (approx. 4.2 US Quarts)
Recommended Transmission Fluid:
Dexron II or equivalent (e.g., ZF Lifeguardfluid 4)
Crash Test Ratings:
Not extensively tested by modern standards; specific NHTSA/IIHS ratings for this era may be limited.
ABS:
Standard Bosch ABS II
Traction Control:
Optional ASC (Automatic Stability Control)
Airbags:
Driver Airbag (Standard)
Seatbelts:
Front and rear seatbelts, pretensioners for front seats
Structural Safety:
Reinforced safety cell, crumple zones.
Infotainment System:
Early generation On-Board Computer (OBC), AM/FM/Cassette stereo system. Optional CD changer.
Driver Assistance Features:
Cruise control, automatic climate control, power adjustable seats with memory.
Connectivity:
Analog cellular telephone integration (optional).
Oil Change Interval:
Every 7,500-10,000 miles or 12 months, whichever comes first (consult manual for specific conditions).
Transmission Service Interval:
Every 60,000 miles or 48 months (fluid and filter replacement).
Coolant Flush Interval:
Every 24,000 miles or 24 months.
Spark Plug Replacement Interval:
Every 60,000 miles (V12 requires 24 spark plugs).
Power Steering Fluid Type:
BMW CHF 11S or equivalent
Engine Management:
Dual DME systems can be complex; coil pack issues, vacuum leaks, and sensor failures are not uncommon. Mention of individual throttle bodies per cylinder.
Cooling System:
Plastic coolant expansion tank can become brittle and crack. Water pump and thermostat failures. Overheating can lead to severe engine damage.
Electrical System:
Aging wiring harnesses, failing control modules (ABS, EML), window regulator failures, door lock actuator issues.
Suspension:
Front control arm bushings, rear self-leveling suspension (SLS) system components can degrade over time.
Interior:
Headliner sagging, seat leather wear, pixilation on instrument cluster displays (often called 'dead pixels').
Bmw Heritage:
BMW has a long-standing reputation for producing driver-focused luxury vehicles with advanced engineering and performance.
E32 Generation:
The E32 generation (1986-1994) represented BMW's flagship sedan, known for its technological advancements and luxury appointments. The 750iL was the top-tier model, debuting the V12 engine.
750Il Introduction:
Introduced in 1987 for the 1988 model year, the 750iL was BMW's first production V12 engine car.
Production Years:
1986-1994 (E32 Generation); 1988-1994 (750iL variant)
Manufacturing Location:
Germany
Automotive Awards:
While specific awards for the 1991 750iL are not widely documented, the E32 generation was recognized for its engineering prowess and luxury. It was often featured in lists of 'cars to own'.
Performance Ratings:
Praised for its smooth, powerful V12 engine and refined ride quality, setting a benchmark for luxury sedans of its time.
