🏷️ Basic Information

Make:

BMW

Model:

5-series

Model Year:

1980

Chassis Code:

E12

E Code:

E12

👋 Introduction

Market Position:

Targeted at BMW 5-series (E12) owners and independent repair facilities seeking accurate, factory-level service information for a classic vehicle. Positions itself as a direct replacement for dealership workshop manuals.

Value Proposition:

Empowers owners to perform dealership-level maintenance and repairs, saving money and increasing vehicle longevity. Provides in-depth technical knowledge for DIY enthusiasts and independent mechanics.

Competitors:

Haynes, Chilton, and other aftermarket repair manuals. This manual differentiates itself by being OEM-derived and highly specific.

Features:

Vehicle-specific, step-by-step instructions, diagrams, illustrations, wiring schematics, specifications, comprehensive A-Z coverage, digital format for ease of use and portability.

📋 Manual Details

Coverage:

All models and all repairs A-Z for 1980 BMW 5-series (E12)

Page Count:

Not Specified (Implied comprehensive)

Manual Type:

Service and Repair Manual

Language:

English

Format:

PDF

Digital Advantages:

Eliminates the need for physical manuals, preventing damage from grease and wear, and allows for instant access and targeted printing of needed sections.

Os Compatibility:

Windows Vista 32/64, XP, ME, 98, NT, 2000, and Mac compatible.

Software Requirements:

Adobe PDF Reader and Winzip (free online).

📖 Manual Coverage

Systems:

Maintenance, Engine, Control System, Mechanical, Fuel Service Specifications, Emission Control, Intake Exhaust Cooling, Lube, Ignition Starting Charging, Auto Transmission, Clutch, Manual Transmission, Transfer Propeller Shaft, Drive Shaft, Differential, Axle Suspension, Tire & Wheel, Brake Control, Brake, Parking Brake, Steering Column, Power Steering, Air Condition, Suppl Restraint System, Seat Belt, Engine Immobilizer, Cruise Control, Wiper & Washer, Door Lock, Meter Audio/Visual, Horn, Windshield/Glass Mirror, Instrument Panel, Seat, Engine Hood/ Door, Exterior & Interior, Electrical, Multiplex/ Can Communication, and more.

Electrical Systems:

Comprehensive coverage of the E12's electrical system, including wiring schematics, component locations, troubleshooting guides for lighting, ignition, charging, instrumentation, and accessories.

Body And Trim:

Includes procedures for exterior and interior trim removal, installation, and repair, as well as engine hood and door mechanisms.

Procedures:

Step-by-step instructions, diagnostics, maintenance, servicing, and complete repair procedures.

Diagnostic Procedures:

Detailed diagnostic procedures for common faults across all covered systems, including fuel system diagnostics, engine performance issues, and electrical system troubleshooting.

Alignment Specifications:

Provides alignment specifications (camber, caster, toe) for front and rear suspensions.

Depth:

Factory highly detailed, technician-level accuracy, covering all repairs from basic maintenance to complex diagnostics and overhauls.

📊 Manual Specifications

File Format:

PDF

File Searchability:

PDF format allows for text searching of keywords within the manual.

Printability:

All pages printable, scalable for enlarged copies.

Image Resolution:

High enough resolution to allow clear viewing and printing of diagrams and illustrations, with the ability to 'blow-up' images.

Binding Type:

Digital (PDF) - no physical binding

Paper Type:

N/A (Digital Format)

⚙️ Engine Specifications

Engine Options 1980:

BMW M30 straight-6 gasoline engines. Common variants include 2.5L (e.g., 525i) and 2.8L (e.g., 528i).

Horsepower Torque 25L:

Approx. 150-165 hp for 2.5L variants (specific output varies by market and tuning).

Horsepower Torque 28L:

Approx. 170-180 hp for 2.8L variants (specific output varies by market and tuning).

Fuel Delivery:

Bosch L-Jetronic or K-Jetronic fuel injection systems, depending on the specific model variant and market.

Carburetor Variants:

While fuel injection was dominant for 1980 models in many markets, earlier E12s or specific regional variants might have used carburetors, which would also be covered if applicable.

Cooling System Type:

Water-cooled, thermostatically controlled with a belt-driven fan.

Oil Type Capacity:

Typically SAE 20W-50 or 10W-40 API SE/SF or equivalent. Capacity around 5-6 liters (e.g., 5.5 liters with filter change for M30B25/B28).

E12 Engine Codes:

Common engine codes include M30B25, M30B28. Specific engine variants like the 520i (M20 inline-6) or earlier 520 (M10 inline-4) may also be covered depending on the manual's exact scope for 1980 models, though the M30 was dominant.

🔧 Transmission

Standard Transmission:

4-speed manual transmission common on base models, 5-speed manual available on sportier variants.

Optional Transmission:

3-speed or 4-speed ZF automatic transmission.

Transmission Fluid:

Manual: Typically SAE 75W-90 or 80W-90 GL-4 gear oil. Automatic: Dexron III (or equivalent) automatic transmission fluid.

Clutch Service:

Detailed instructions for clutch inspection, replacement, and adjustment for manual transmission models.

📐 Dimensions

Wheelbase:

Approx. 2770 mm (109.1 inches)

Length:

Approx. 4620 mm (181.9 inches)

Width:

Approx. 1725 mm (67.9 inches)

Height:

Approx. 1410 mm (55.5 inches)

Front Track:

Approx. 1430 mm (56.3 inches)

Rear Track:

Approx. 1450 mm (57.1 inches)

Curb Weight:

Approx. 1350-1450 kg (2976-3197 lbs), depending on engine and options.

Gross Vehicle Weight:

Not specified, but typically around 1900-2000 kg.

🛡️ Safety Features

Safety Ratings:

No official crash test ratings from modern agencies exist for this era of vehicle. Safety features are typical for the late 1970s/early 1980s.

Active Safety:

Four-wheel disc brakes (ventilated front), power-assisted braking system, independent front suspension.

Passive Safety:

Three-point seat belts (front), padded dashboard and steering wheel, crumple zones, safety cage construction.

Steering Column Safety:

Features a collapsible steering column designed to absorb impact energy in a frontal collision.

💡 Technology Features

Infotainment System:

Basic AM/FM radio, often with cassette player. Speaker systems were typically modest.

Driver Assistance Features:

Very limited by modern standards. Features like cruise control were optional and manually operated. ABS was not commonly available or standard on E12 models.

Connectivity Features:

None by modern definition. Antennas for radio were the primary external electronic connection.

🔧 Maintenance

Oil Change Interval:

Every 5,000 - 7,500 miles (8,000 - 12,000 km) or 6-12 months, using appropriate quality oil.

Spark Plug Replacement:

Approximately 20,000 - 30,000 miles (32,000 - 48,000 km), depending on type (e.g., standard, resistor).

Coolant Flush:

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

Timing Belt Chain Maintenance:

M30 engines use a timing chain, which is generally maintenance-free for the life of the engine, though tensioners and guides may require inspection/replacement over time.

Brake Fluid:

DOT 3 or DOT 4 brake fluid.

Power Steering Fluid:

ATF Dexron II or III.

Coolant Type:

Ethylene glycol based antifreeze mixed 50/50 with distilled water.

Transmission Oil Manual:

SAE 75W-90 GL-4 Gear Oil. Capacity approximately 1.4-1.8 liters depending on transmission type.

Differential Oil:

Hypoid gear oil, SAE 90 GL-5. Capacity approximately 1.2-1.5 liters.

Common Problems:

Rust (wheel arches, sills, subframes), fuel injection system issues (e.g., fuel pump, injectors, airflow meter), vacuum leaks, cooling system component failures (radiator, hoses, water pump), electrical gremlins, worn suspension bushings, and older automatic transmission issues.

Fuel System Troubleshooting:

Specific guidance on diagnosing and repairing K-Jetronic or L-Jetronic fuel injection systems, including fuel pressure testing, injector cleaning, and airflow meter adjustments.

📚 Vehicle History

Brand Heritage:

BMW, Bayerische Motoren Werke AG, a German luxury and performance automobile manufacturer with a long history of producing high-quality, driver-focused vehicles.

E12 Evolution:

The E12 was the first generation of the BMW 5 Series, introduced in 1972 as a successor to the BMW E3 sedan (New Class). It established the successful executive sedan segment for BMW, blending luxury, performance, and practicality. The 1980 model year represents a mid-cycle update with minor cosmetic and mechanical refinements.

E12 Market Impact:

The E12 was instrumental in establishing BMW as a serious competitor in the global executive sedan market, competing against models like the Mercedes-Benz W123. It laid the groundwork for future generations of the 5 Series.

Production Years:

1972-1981

Manufacturing Locations:

Germany (Dingolfing plant) and South Africa.

🏆 Awards & Recognition

Model Awards:

The E12 5 Series was critically acclaimed upon its release for its blend of sportiness and luxury, often lauded by automotive journalists of its era for its handling and build quality, establishing BMW's reputation in the executive sedan market.