For the 1981 Mercedes Benz 300td with the 3.0L 5-cylinder Engine Code 617.952 J Diesel Turbo, the engine oil capacity is 7.9 quarts with a filter change. Recommended viscosities include 0W-30 and 0W-40 for all temperatures, or 5W-30, 5W-40, and 5W-50 for temperatures above -25°C. AMSOIL recommends AMSOIL 5W-40 FS 100% Synthetic European Motor Oil (EFMQT-EA) for high-performance protection.
What oil does a 1981 Mercedes Benz 300td take?
The 1981 Mercedes Benz 300td (Engine Code 617.952 J) requires specific oil viscosities based on operating temperatures. The AMSOIL lookup identifies the following viscosity options for this application:
AMSOIL product recommendations
Based on the AMSOIL lookup for your 1981 Mercedes Benz 300td, the following products are recommended to maintain engine and system health.
Engine Oil Recommendations
| Product Name | Part Code |
|---|---|
| AMSOIL 5W-40 FS 100% Synthetic European Motor Oil | EFMQT-EA |
| AMSOIL 0W-40 FS 100% Synthetic European Motor Oil | EFOQT-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 |
Transmission & Steering Fluids
| Product Name | Part Code |
|---|---|
| AMSOIL Signature Series Multi-Vehicle ATF | ATFPK-EA |
| AMSOIL OE Multi-Vehicle ATF | <OTFQT-EA |
| AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid | PSFCN-EA |
Oil Viscosity Options
| Temperature Range | Viscosity |
|---|---|
| All Temperatures | 0W-30, 0W-40 |
| Above -20°C | 10W-40 |
| Above -25°C | 5W-30, 5W-40, 5W-50 |
AMSOIL lookup oil grade: SEO41
How much oil does it take with a filter change?
For the 3.0L 5-cylinder diesel engine, the capacity is 7.9 quarts when including 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.
Engine Oil Specifications & Torque
| Specification | Value |
|---|---|
| Oil Drain Plug Torque | 20 ft/lbs |
| Oil Specification | Not confirmed from source data |
Maintenance Tip: Allow 5 minutes after refilling or turning the engine off before checking the oil level to ensure an accurate reading.
Diesel maintenance notes for this vehicle
- Oil Filter: No specific AMSOIL recommendations available from source data.
- Air Filter: No specific AMSOIL recommendations available from source data.
- Coolant Capacity: 10.6 quarts.
- Automatic Transmission (722.1): Total fill capacity is 6.4 quarts; initial fill is 5.1 quarts.
- Transfer Case: Rear capacity is 2.3 pints.
- Brake Fluid Note: The AMSOIL lookup note references using DOT 4 plus, 0009895605090109 (previously 0009895605110111, 000989080701) or products approved on MB Sheet 331.0.
Common diesel oil-related concerns and how AMSOIL products may help
Maintaining a high-mileage diesel engine like the OM617 requires addressing specific operational stresses.
| Concern | Why it matters | AMSOIL product from this lookup | How it may help | Important limitation |
|---|---|---|---|---|
| Injector Deposits | Dirty injectors reduce performance and increase smoke. | Diesel Injector Clean | Cleans injectors and lubricates pumps to reduce wear. | Diagnosis or repair may be required for mechanical failure. |
| Cold Weather Starting | Diesel fuel can gel in low temperatures. | Diesel Cold Flow Additive | Fights gelling and lowers cold filter-plugging point. | Does not replace proper fuel storage. |
| Low Cetane/Power Loss | Lower cetane numbers can impact combustion efficiency. | Diesel Cetane Boost | Increases cetane up to 8 points for improved startability and idle. | Does not repair damaged fuel systems. |
Common maintenance concerns for this vehicle
Owners of the W123 chassis with the OM617 engine should focus on preserving mechanical integrity. Key areas include:
- Cooling System: Ensuring proper coolant concentration to protect metals, gaskets, and hoses.
- Lubrication Integrity: Maintaining high-mileage diesel engines through optimized oil viscosity selection.
- Fuel System Health: Monitoring injector performance and fuel lubricity to prevent wear in the high-pressure components.
About this vehicle
The 1981 Mercedes-Benz 300TD is a diesel-powered variant of the W123 series, an executive car range produced by Mercedes-Benz between 1975 and 1986. The W123 chassis earned a global reputation for exceptional durability and reliability, frequently utilized as taxicabs in Europe due to its ability to exceed 500,000 kilometers with only minor mechanical attention.
This specific model features the OM617 engine, a straight-5 diesel engine family that was a staple of Mercedes-Benz lineups throughout the 1970s and 1980s. The OM617 engine is historically significant for its longevity; it is often cited as one of the most reliable engines ever produced, with some units reaching over 1,000,000 km without requiring a rebuild. This reliability contributed significantly to Mercedes-Benz’s popularity in North America during the 1980s.
Maintenance research for these vehicles often centers around preserving the mechanical integrity of the diesel system and ensuring the cooling and lubrication systems are optimized for high-mileage operation. While the W123 platform is well-documented, users should verify specific sub-model details as production variations existed across different global markets.
Recall, TSB, and manufacturer communication notes
Official recall/TSB research was not included in this draft yet. Owners should verify open recalls by VIN through the NHTSA or a Mercedes-Benz dealership to ensure compliance with any active safety communications.
Common questions about this vehicle’s diesel oil and maintenance
What is the oil capacity for my 1981 300td?
The capacity is 7.9 quarts when performing an oil change with a filter. If your vehicle has an oil cooler, you may need additional oil.
Which AMSOIL oil is best for my Mercedes diesel?
For European diesel engines, AMSOIL lists 5W-40 FS and 0W-40 FS 100% Synthetic European Motor Oils.
How much transmission fluid does the 722.1 automatic take?
The total fill capacity for the 4-speed 722.1 transmission is 6.4 quarts, while the initial fill is 5.1 quarts.
Can I use any antifreeze in my Mercedes?
The AMSOIL lookup note references specific requirements; it suggests using products like AMSOIL Passenger Car & Light Truck Antifreeze or concentrated propylene glycol options.
What should I do if my diesel fuel gels in winter?
You may consider using a fuel additive like AMSOIL Diesel Cold Flow Fuel Additive, which is designed to fight gelling and lower the cold filter-plugging point.
How do I check for recalls on my 300td?
Always verify open recalls by your specific VIN through official manufacturer channels or the NHTSA website, as applicability depends on production dates and equipment.
Disclaimer: Always verify all capacities, specifications, and torque values against your official owner’s manual or factory service literature before performing maintenance.