🏷️ Basic Information

Make:

Mercedes-Benz

Model:

380SL

Year:

1985

Chassis Code:

R107

Engine Code:

M116 (3.8L V8)

👋 Introduction

Positioning:

The Mercedes-Benz R107 chassis, particularly the 380SL, represented the pinnacle of luxury roadsters in its era, blending robust German engineering with opulent comfort and performance. This manual serves the discerning owner or mechanic dedicated to maintaining this classic.

Competitors:

Competed against vehicles like the Jaguar XJS, Porsche 928, and certain high-end American convertibles, but differentiated itself with its build quality, V8 engine refinement, and enduring design.

Vehicle Appeal:

Iconic design, smooth V8 power, convertible and hardtop options, renowned Mercedes-Benz build quality and longevity.

Value Proposition:

Provides essential information for owners to perform their own maintenance or for mechanics to accurately diagnose and repair issues, ensuring the longevity and optimal performance of a cherished classic automobile.

📋 Manual Details

Primary Coverage:

Service, Repair, Maintenance, Diagnostics, Troubleshooting, Electrical Systems, Bodywork

Secondary Coverage:

Component Overhaul, Technical Specifications, Diagrams, Torque Values

Estimated Page Count:

Approximately 1000+

Type:

Service and Repair Workshop Manual

Language:

English

Format:

Digital (likely PDF)

📖 Manual Coverage

Engine:

Complete engine mechanicals, cooling system, lubrication, fuel injection (Bosch K-Jetronic), ignition system, exhaust system

Transmission:

Automatic transmission (e.g., 4G-Tronic/722.3) service, overhaul, fluid and filter replacement, troubleshooting

Drivetrain:

Rear axle, differential, drive shafts, universal joints

Suspension:

Front and rear suspension components, shock absorbers, springs, bushings, alignment procedures

Brakes:

Hydraulic system, disc brakes (front and rear), parking brake, ABS (if equipped), fluid replacement, bleeding procedures

Steering:

Power steering system, steering box, linkages, troubleshooting

Electrical:

Complete wiring diagrams, battery, charging system, starter, lighting, instruments, power windows, power seats, climate control, radio

Bodywork:

Body panels, doors, windows, convertible top mechanism, trim, rust repair considerations

Maintenance:

Routine maintenance checks, oil change, filter replacement, tune-up procedures, lubrication points

Repair:

Engine component replacement (e.g., spark plugs, belts, hoses), transmission service, brake pad replacement, suspension component repair

Troubleshooting:

Diagnostic flowcharts, common problem identification and solutions for various systems

Overhaul:

Detailed instructions for rebuilding major components like the engine and transmission

Diagnostics:

Identification of diagnostic trouble codes (DTCs) where applicable, specific diagnostic tests for electrical and mechanical systems

Depth:

Comprehensive, suitable for professional mechanics and advanced DIY enthusiasts; covers from basic maintenance to full engine and transmission rebuilds

📊 Manual Specifications

File Type:

PDF

Searchability:

Searchable text for quick information retrieval

Printability:

Printable pages for on-the-go reference

Image Resolution:

High-resolution diagrams and illustrations

Binding:

N/A (Digital Format)

Paper:

N/A (Digital Format)

Completeness:

Represents a factory-level or equivalent workshop manual, offering comprehensive repair and service procedures.

⚙️ Engine Specifications

Engine Type:

V8, SOHC (Single Overhead Camshaft)

Displacement:

3839 cc (3.8 Liters)

Bore X Stroke:

86.0 mm x 80.25 mm

Compression Ratio:

8.3:1

Horsepower Gross:

155 hp @ 4750 rpm (USA spec, may vary slightly)

Torque Gross:

205 lb-ft @ 2500 rpm (USA spec, may vary slightly)

Fuel Delivery:

Bosch CIS-E (Continuous Injection System - Electronic) Fuel Injection

Fuel Type:

Premium Unleaded Gasoline (91+ octane recommended)

Ignition Type:

Electronic Ignition with Distributor

Coolant Capacity:

Approx. 10.5 Liters (11.1 US Quarts)

Oil Capacity With Filter:

Approx. 7.5 Liters (7.9 US Quarts)

Recommended Oil Viscosity:

SAE 15W-40 or 10W-30 (check owner's manual for specific climate recommendations)

🔧 Transmission

Transmission Type:

4-speed Automatic (4G-Tronic / 722.3)

Optional Transmission:

None offered for 1985 380SL in most markets

Torque Converter:

Lock-up torque converter for improved fuel efficiency

Transmission Fluid Type:

MB 236.1 Specification Automatic Transmission Fluid (e.g., Dexron III equivalent often used)

Transmission Fluid Capacity:

Approx. 8.0 Liters (8.5 US Quarts) for a full refill

📐 Dimensions

Length:

4575 mm (180.1 in)

Width:

1790 mm (70.5 in)

Height:

1303 mm (51.3 in)

Wheelbase:

2460 mm (96.9 in)

Front Track:

1448 mm (57.0 in)

Rear Track:

1430 mm (56.3 in)

Curb Weight:

Approx. 1630 kg (3593 lbs)

Gross Vehicle Weight Rating:

Approx. 2000 kg (4409 lbs)

Trunk Capacity:

Approx. 220 Liters (7.8 cu ft)

🛡️ Safety Features

Crash Test History:

While specific 1985 ratings are scarce, the R107 chassis was engineered with a focus on occupant protection for its era, featuring a robust unibody structure.

Active Safety Systems:

Four-wheel disc brakes, power-assisted steering, limited-slip differential (optional on some models)

Passive Safety Features:

Seat belts (inertia reel), padded dashboard and steering wheel, reinforced A-pillars, crumple zones

💡 Technology Features

Infotainment System:

Basic AM/FM radio with cassette player, optional premium sound systems were available.

Driver Assistance Features:

ABS (Anti-lock Braking System) became more common in later R107 models, but its availability on a 1985 380SL would depend on specific options. Cruise control was a common luxury feature.

Connectivity:

No modern connectivity features such as Bluetooth or USB ports were standard.

🔧 Maintenance

Oil Change Interval:

Every 15,000 km (9,000 miles) or 12 months, whichever comes first (synthetic oil recommended)

Air Filter Replacement:

Every 30,000 km (18,000 miles) or as needed

Spark Plug Replacement:

Every 50,000 km (30,000 miles) for platinum-tipped plugs, or as specified

Transmission Fluid Filter Change:

Every 60,000 km (36,000 miles)

Brake Fluid Type:

DOT 4

Power Steering Fluid Type:

MB 236.3 Specification Hydraulic Fluid (e.g., power steering fluid)

Coolant Type:

Ethylene glycol based coolant, typically a 50/50 mix with distilled water

Common Engine Issues:

K-Jetronic fuel system component wear (e.g., fuel distributor, airflow meter), vacuum leaks, timing chain tensioner wear, oil cooler seal leaks

Common Chassis Issues:

Subframe rust, door seal deterioration, convertible top hydraulic leaks or mechanism issues, suspension bushing wear, climate control system faults (e.g., HVAC blower, vacuum actuators)

Common Electrical Issues:

Failing vacuum lines for central locking and climate control, brittle wiring insulation, faulty door lock actuators, dashboard indicator light failures

📚 Vehicle History

Mercedes Benz Heritage:

Mercedes-Benz has a long-standing reputation for engineering excellence, safety, and luxury in high-performance automobiles, dating back to the invention of the automobile itself.

R107 Lineage:

The R107 SL generation replaced the iconic W113 'Pagoda' SL and was produced from 1971 to 1989. The 380SL was introduced in 1972 (Europe) and 1973 (USA) as a V8 alternative to the inline-six models, evolving through various engine displacements and updates throughout its extensive production run.

Production Years For 380Sl:

1972–1985 (though 1985 was the final year for the 3.8L V8 in this chassis)

Manufacturing Location:

Bremen, Germany

🏆 Awards & Recognition

Historical Acclaim:

The R107 SL series was widely praised for its elegant styling, robust build quality, and comfortable ride, making it a desirable grand touring convertible for decades.

Reliability Perception:

Perceived as highly reliable and durable when properly maintained, a hallmark of Mercedes-Benz engineering from this era.