What oil does a 1981 Mercedes Benz 300D take?
For the 1981 Mercedes Benz 300D with the 3.0L 5-cylinder engine (Code 616.912 B Diesel), the recommended 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 5W-40 FS 100% Synthetic European Motor Oil.
AMSOIL product recommendations
Based on the AMSOIL lookup for this specific Mercedes Benz 300D, the following products are recommended for your maintenance needs:
Engine Oil
| Product Name | Viscosity | Part Code |
|---|---|---|
| AMSOIL 5W-40 FS 100% Synthetic European Motor Oil | 5W-40 | EFMQT-EA |
| AMSOIL 0W-40 FS 100% Synthetic European Motor Oil | 0W-40 | EFOQT-EA |
Automatic Transmission Fluid
| Product Name | Part Code |
|---|---|
| AMSOIL Signature Series Multi-Vehicle 100% Synthetic ATF | ATFPK-EA |
| AMSOIL OE Multi-Vehicle 100% Synthetic ATF | OTFQT-EA |
Coolant & Brake Fluid
| Product Name | Part Code |
|---|---|
| AMSOIL Passenger Car & Light Truck Antifreeze & Coolant | ANTPC1G-EA |
| AMSOIL Propylene Glycol Antifreeze and Engine Coolant | ANT1G-EA |
| AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid | BFLVCN-EA |
Other Fluids & Additives
| Product Name | Part Code |
|---|---|
| AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid | PSFCN-EA |
| AMSOIL Diesel Injector Clean Fuel Additive | ADFPCN-EA |
Engine Oil Specifications & Details
How much oil does it take with a filter change?
The engine requires 6.9 quarts of oil when performing a service that includes the oil filter. Note that if your model is equipped with an oil cooler, additional oil may be required when the cooler is drained during service.
Oil Viscosity Guide
| Temperature Condition | Recommended Viscosity |
|---|---|
| All Temperatures | 0W-30, 0W-40 |
| Above -20°C | 10W-40 |
| Above -25°C | 5W-30, 5W-40, 5W-50 |
Engine Service Specifications
- AMSOIL lookup oil grade: SEO41
- Oil Drain Plug Torque: 20 ft/lbs
- Oil Filter: No recommendations available from source data.
- Air Filter: No recommendations available from source data.
Transmission & Differential Specifications
Automatic Transmission
For the 4-speed 722.1 automatic transmission, the capacities are as follows:
- Total Fill Capacity: 6.4 quarts
- Initial Fill Capacity: 5.1 quarts
Differential
The rear differential capacity is confirmed at 2.3 pints.
Diesel maintenance notes for this vehicle
- Oil Level Check: After refilling or turning the engine off, allow 5 minutes to pass before checking the oil level.
- Cooling System: The AMSOIL lookup lists ANTPC1G-EA and ANT1G-EA for cooling system protection.
- Brake Fluid: The AMSOIL lookup note references DOT 4 plus or products approved on MB Sheet 331.0 for this application.
Common diesel oil-related concerns and how AMSOIL products may help
| Concern | Why it matters | AMSOIL product from this lookup | How it may help | Important limitation |
|---|---|---|---|---|
| Diesel Injector Deposits | Dirty injectors can reduce efficiency and cause wear. | ADFPCN-EA | Cleans dirty injectors and lubricates pumps/injectors to reduce wear. | Diagnosis or repair may still be required for mechanical failures. |
| European Engine Demands | High-performance European diesels require specific additive packages. | EFMQT-EA | Designed for unique demands of diesel European vehicles with a precise blend of synthetic base oils. | Not confirmed to repair existing engine damage. |
Common maintenance concerns for this vehicle
Owners of the W123 chassis series often focus on preventative maintenance of seals, gaskets, and heavy-duty suspension components due to the high-mileage nature of these vehicles. Maintenance typically focuses on diesel-specific systems, including fuel injection components and cooling systems.
Recall, TSB, and manufacturer communication notes
Official NHTSA recall research for the 1981 Mercedes Benz 300d returned no recall records. Official NHTSA complaint research also returned no complaint records. However, this does not prove the vehicle has no issues; owners should always verify open recalls by VIN as applicability depends on production date and equipment.
About this vehicle
The 1981 Mercedes-Benz 300d is equipped with a 3.0L 5-cylinder engine (Engine Code 616 912 B). This model year belongs to the W123 chassis series, which was produced between November 1975 and January 1986. The W123 is historically recognized for its exceptional durability and reliability; it has been famously utilized in demanding environments, such as taxicabs in Germany, due to its ability to reach very high mileages.
This vehicle belongs to the executive car era of Mercedes-Benz. Owners of this era typically prioritize longevity and robust mechanical performance. Because these vehicles are known for operating on rough roads and in demanding environments, maintaining proper lubrication is a key part of preserving their legendary durability. It is critical that owners verify specific chassis and engine specifications against a workshop manual before performing major repairs to ensure parts compatibility.
Common questions about this vehicle’s diesel oil and maintenance
What is the oil capacity for my 1981 Mercedes 300D?
The capacity is 6.9 quarts when including a filter change. If your model has an oil cooler, you may need additional oil.
Which AMSOIL oil is best for my European diesel engine?
AMSOIL recommends EFMQT-EA or EFOQT-EA, which are designed for the unique demands of European diesel vehicles.
How much transmission fluid does the 722.1 automatic take?
The total fill capacity is 6.4 quarts, while the initial fill is 5.1 quarts.
Can I use AMSOIL for my power steering system?
Yes, the AMSOIL lookup lists PSFCN-EA for this application.
What should I use for brake fluid?
The AMSOIL lookup note references DOT 4 plus or products approved on MB Sheet 331.0, and lists BFLVCN-EA.
How do I maintain my diesel injectors?
AMSOIL offers the ADFPCN-EA Diesel Injector Clean Fuel Additive, which is designed to clean dirty injectors and lubricate pumps and injectors to reduce wear.
Disclaimer: Not all information provided has been verified by a certified mechanic. Always consult your owner’s manual or a professional technician before performing vehicle maintenance.