For the 1981 Mercedes Benz 240D with the 2.4L 4-cylinder engine (Code 616.912 A Diesel), the oil capacity is 6.9 quarts with a filter change. Recommended viscosities include 0W-30 or 0W-40 for all temperatures, 10W-40 for temperatures above -20°C, and 5W-30, 5W-40, or 5W-50 for temperatures above -25°C. AMSOIL recommends AMSOIL 5W-40 FS 100% Synthetic European Motor Oil or AMSOIL 0W-40 FS 100% Synthetic European Motor Oil for optimal protection.
What oil does a 1981 Mercedes Benz 240D take?
The 1981 Mercedes Benz 240D with the 2.4L OM616 engine requires specific oil viscosities based on operating temperatures. The AMSOIL lookup identifies an oil grade of SEO41. For optimal performance, select a viscosity that matches your climate: 0W-30 or 0W-40 for all temperatures, 10W-40 for environments above -20°C, and 5W-30, 5W-40, or 5W-50 for environments above -25°C.
AMSOIL product recommendations
Based on the specific requirements for the 1981 Mercedes Benz 240D, AMSOIL provides high-performance synthetic options for engine lubrication, cooling, and transmission maintenance.
| Component | AMSOIL Product Name | Product Code |
|---|---|---|
| Engine Oil | 5W-40 FS 100% Synthetic European Motor Oil | EFMQT-EA |
| Engine Oil | 0W-40 FS 100% Synthetic European Motor Oil | EFOQT-EA |
| Coolant | Passenger Car & Light Truck Antifreeze & Coolant | ANTPC1G-EA |
| Coolant | Propylene Glycol Antifreeze and Engine Coolant | ANT1G-EA |
| Automatic Transmission | Signature Series Multi-Vehicle 100% Synthetic ATF | ATFPK-EA |
| Automatic Transmission | OE Multi-Vehicle 100% Synthetic ATF | OTFQT-EA |
| Manual Transmission | Signature Series Multi-Vehicle 100% Synthetic ATF | ATFPK-EA |
| Manual Transmission | OE Multi-Vehicle 100% Synthetic ATF | OTFQT-EA |
| Brake Fluid | DOT 3 and DOT 4 100% Synthetic Brake Fluid | BFLVCN-EA |
| Power Steering | 100% Synthetic Multi-Vehicle Power Steering Fluid | PSFCN-EA |
Engine Oil Specifications
| Viscosity Range | Temperature Condition |
|---|---|
| 0W-30, 0W-40 | All Temperatures |
| 10W-40 | Above -20°C |
| 5W-30, 5W-40, 5W-50 | Above -25°C |
AMSOIL lookup oil grade: SEO41
Engine Oil Capacity and Torque
| Description | Value |
|---|---|
| Capacity (with filter) | 6.9 quarts |
| Oil Drain Plug Torque | 30 ft/lbs |
Note: On models equipped with an oil cooler, additional oil may be required when the cooler is drained. Always allow 5 minutes after refilling or turning off the engine before checking the oil level.
How much transmission fluid does it take?
Transmission capacity depends on whether your vehicle is equipped with an automatic or manual gearbox. For the 4-speed automatic (722.1), the total fill capacity is 6.4 quarts, while the initial fill is 5.1 quarts. The manual transmission requires 3.4 pints of fluid.
Automatic Transmission (722.1) Capacities
| Fill Type | Capacity |
|---|---|
| Total Fill | 6.4 quarts |
| Initial Fill | 5.1 quarts |
Manual Transmission Capacities
| Component | Capacity |
|---|---|
| Manual Transmission (716.005 4-SPD) | 3.4 pints |
Coolant and Brake Fluid Specifications
Maintaining the cooling system is vital for the OM616 engine. The coolant capacity is 10.6 quarts. For braking systems, the AMSOIL lookup note references using DOT 4 plus or products approved on MB Sheet 331.0.
Coolant Details
| Description | Value |
|---|---|
| Capacity | 10.6 quarts |
AMSOIL Recommendations:
– AMSOIL Passenger Car & Light Truck Antifreeze & Coolant (OAT formulation, 50/50 pre-mix)
– AMSOIL Propylene Glycol Antifreeze and Engine Coolant (Concentrated – requires mixing with distilled or high-quality water)
Brake and Clutch Fluid
For the clutch application (Recommended for HB), the notes specify Hydraulic Brake Fluid, DOT 3. For brake applications (Recommended for HBH), use DOT 4 plus or products approved on MB Sheet 331.0.
Diesel maintenance notes for this vehicle
- Oil Level Check: After refilling the engine oil, wait at least 5 minutes before checking the level to ensure an accurate reading.
- Cooler Considerations: If your specific model has an oil cooler, be prepared for higher oil consumption during a service if the cooler is drained.
- Coolant Mixing: If using concentrated AMSOIL Propylene Glycol Antifreeze, ensure it is mixed with distilled or high-quality water as required.
- Transmission Fluid: The manual transmission requires GLS50 specification for all temperatures.
Common diesel oil-related concerns and how AMSOIL products may help
| Concern | Why it matters | AMSOIL Product | How it may help | Important Limitation |
|---|---|---|---|---|
| Cold Starts | Thick oil can cause wear during startup. | 0W-40 FS | Provides flow in low temperatures. | Not a substitute for mechanical repair. |
| Engine Wear | High mileage diesel engines require protection. | 5W-40 FS | Designed for unique European diesel demands. | Not a substitute for mechanical repair. |
| Cooling System Corrosion | Metal erosion can lead to leaks. | Antifreeze & Coolant | Protects metals, gaskets, and hoses. | Not a substitute for mechanical repair. |
Common maintenance concerns for this vehicle
Owners of the W123 chassis often focus on long-term engine health. Key areas include:
- Cooling System Integrity: Given the age of these vehicles, checking hoses and gaskets is critical to prevent overheating.
- Transmission Health: Ensuring correct fluid levels in the 722.1 automatic transmission to maintain smooth shifting.
- Fuel and Air Systems: Maintaining clean fuel and air filtration to support the legendary reliability of the OM616 diesel engine.
Recall, TSB, and manufacturer communication notes
Official NHTSA recall research for the 1981 Mercedes Benz 240d returned no recall records at this time. Additionally, no consumer complaints were found in the NHTSA database for this specific year/make/model combination. However, owners should always verify open recalls by VIN, as applicability can depend on production date, trim, and equipment.
About this vehicle
The 1981 Mercedes-Benz 240d is a notable representative of the W123 series, a range of executive cars produced by Mercedes-Benz between November 1975 and January 1986. The W123 chassis earned a global reputation for exceptional durability and reliability, frequently utilized as taxicabs in Germany due to its ability to reach high mileages, often exceeding 500,000 kilometers with only minor mechanical issues. Because of this robust construction, these vehicles are highly esteemed in various regions for their ability to navigate rough roads and their requirement for infrequent maintenance.
At the heart of this specific model is the OM616 engine. The OM616 is an inline-four diesel engine family that was widely used throughout the 1970s and 1980s. The ‘OM’ designation stands for ‘Öl-Motor’ (Oil Motor), a naming convention Mercedes-Benz continues to use for its diesel engines today. The OM616 is a bored-out evolution of the previous 2.2-litre OM615 engine. This engine family has demonstrated significant longevity, with some versions continuing to be produced by Force Motors in India well after their original Mercedes-Benz production cycles ended.
For owners and maintenance enthusiasts, this vehicle represents a classic era of diesel engineering where mechanical simplicity and longevity were paramount. Research into this specific vehicle should focus on the nuances of the W123 chassis and the OM616 engine’s cooling and fuel systems, which are critical for maintaining its legendary reliability. Note that while this research provides a strong foundation based on the W123 chassis and OM616 engine family, specific technical details such as exact horsepower or torque should be verified against the vehicle’s specific VIN or official service manuals.
Common questions about this vehicle’s diesel oil and maintenance
What is the oil capacity for a 1981 Mercedes 240D?
The engine requires 6.9 quarts of oil when performing a service that includes a filter change.
Which AMSOIL oil is best for my diesel Mercedes?
AMSOIL recommends 5W-40 FS or 0W-40 FS 100% Synthetic European Motor Oil, which is designed for the unique demands of European diesel vehicles.
How do I choose the right viscosity for my climate?
Use 0W-30 or 0W-40 for all temperatures. If you operate in warmer climates (above -20°C), 10W-40 is appropriate. For colder climates (above -25°C), consider 5W-30, 5W-40, or 5W-50.
What should I use for the automatic transmission?
For the 722.1 4-speed automatic, AMSOIL lists Signature Series Multi-Vehicle ATF or OE Multi-Vehicle ATF.
Does this vehicle have any active recalls?
NHTSA research returned no recall records for this model, but you should always verify your specific VIN with a dealer to check for open manufacturer communications.
What is the torque spec for the oil drain plug?
The oil drain plug should be torqued to 30 ft/lbs.
Disclaimer: Not all information provided has been verified by the manufacturer. Always consult your owner’s manual or a certified professional before performing maintenance.