For the 1983 Mercedes Benz 300SD with the 3.0L 5-cylinder Engine Code 617.951 H Diesel Turbo, the engine oil capacity is 7.9 quarts (including filter replacement). 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 (EFMQT-EA) for this application.
What oil does a 1983 Mercedes Benz 300SD take?
The 1983 Mercedes Benz 300SD with the 617.951 H engine requires specific viscosities based on operating temperatures. The AMSOIL lookup oil grade is SEO41. For all temperature ranges, 0W-30 and 0W-40 are suitable. If operating above -20°C, use 10W-40. For temperatures above -25°C, options include 5W-30, 5W-40, or 5W-50.
AMSOIL product recommendations
Based on the vehicle specifications, AMSOIL offers several high-performance synthetic options to maintain your Mercedes diesel engine and its supporting systems.
Engine Oil Recommendations
| Product Name | Viscosity | 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 |
Transmission & Coolant Recommendations
| Component | Product Name | Code |
|---|---|---|
| Automatic Transmission | AMSOIL Signature Series Multi-Vehicle ATF | ATFPK-EA |
| Automatic Transmission | AMSOIL OE Multi-Vehicle ATF | OTFQT-EA |
| Engine Coolant | AMSOIL Passenger Car & Light Truck Antifreeze | ANTPC1G-EA |
| Engine Coolant | AMSOIL Propylene Glycol Antifreeze | ANT1G-EA |
Brake & Steering Recommendations
| Component | Product Name | Code |
|---|---|---|
| Brake Fluid | AMSOIL DOT 3 and DOT 4 Synthetic Brake Fluid | BFLVCN-EA |
| Power Steering | AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid | PSFCN-EA |
Engine Oil Specifications & Details
| Detail | Value |
|---|---|
| Oil Viscosity Options | 0W-30, 0W-40 (All Temps); 10W-40 (> -20°C); 5W-30, 5W-40, 5W-50 (> -25°C) |
| Oil Capacity (with filter) | 7.9 quarts |
| Oil Drain Plug Torque | 20 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.
Oil Filter & Air Filter Information
No specific AMSOIL filter recommendations are available for the oil filter or air filter at this time. Please consult your owner’s manual for part numbers.
How much transmission fluid does it take?
For the 4-speed automatic transmission (722.3), the total fill capacity is 7.7 quarts, while the initial fill capacity is 6.6 quarts. The AMSOIL lookup note references the 722.3 specification for this application.
What are the coolant and brake fluid requirements?
The engine cooling system has a capacity of 13.2 quarts. For braking, the vehicle requires DOT 4 plus or products approved on MB Sheet 331.0. The AMSOIL lookup note references these requirements for your application.
Coolant & Brake Fluid Specifications
| Component | Capacity | Notes |
|---|---|---|
| Coolant | 13.2 quarts | Not confirmed from source data for specific type beyond AMSOIL options. |
| Brake Fluid | Not confirmed from source data | Use DOT 4 plus or MB Sheet 331.0 approved products. |
Differential & Transfer Case
The rear transfer case capacity is listed at 2.3 pints. No specific lubricant recommendations were provided in the source data for this component.
Diesel maintenance notes for this vehicle
- Oil Level Check: Always allow 5 minutes after refilling or turning off the engine before checking the oil level to ensure an accurate reading.
- Cooler Considerations: If your model has an oil cooler, be prepared to use extra oil if the cooler is drained during service.
- Brake Fluid Standards: Ensure any replacement brake fluid meets the MB Sheet 331.0 standard or uses DOT 4 plus as noted in the technical documentation.
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 performance and increase smoke. | Diesel Injector Clean | Cleans dirty injectors and lubricates pumps/injectors. | Treat rate varies by bottle size. |
| Cold Weather Starting | Diesel fuel can gel in extreme cold, causing starting issues. | Diesel Cold Flow Additive | Lowers cold filter-plugging point (CFPP) by up to 40°F. | Not a replacement for proper fuel storage. |
| Engine Storage Rust | Long periods of inactivity can lead to internal component rust. | Engine Fogging Oil | Provides effective rust prevention for internal components. | Designed for storage/inactivity. |
| Low Cetane/Power Loss | Lower cetane numbers can lead to rough idling and less power. | Diesel Cetane Boost | Increases cetane up to 8 points and improves startability. | One ounce treats up to 10 gallons. |
Common maintenance concerns for this vehicle
Based on the mechanical profile of the OM617 engine family, owners should consider the following:
- Fuel System Integrity: Maintaining the Bosch in-line injection pump and fuel injectors is critical for reliable operation.
- Glow Plug System: Ensuring glow plugs are functioning correctly is essential for dependable cold starts.
- Turbocharger Monitoring: As a turbodiesel, regular inspection of the turbocharger and associated vacuum-operated controls is recommended.
- Cooling System: Monitor the cooling system closely to prevent overheating in these high-mileage engines.
About this vehicle
The 1983 Mercedes-Benz 300SD represents a significant era in diesel luxury, sitting within the lineage of the brand’s high-end S-Class offerings. This vehicle is part of a tradition where Mercedes-Benz provided robust diesel powerplants for their flagship luxury sedans and coupes. Historically, the ‘300SD Turbodiesel’ designation was utilized during the early 1980s, appearing in various iterations within the W126 and other chassis series.
At the heart of this vehicle is the OM617 engine family. The 300SD utilizes a 3.0L 5-cylinder configuration, which serves as a foundational predecessor to later engines like the OM602 and the straight-6 OM603. These engines are renowned for their durability and mechanical simplicity compared to modern high-pressure common rail systems. Owners of this era’s Mercedes diesel engines typically focus on maintaining the integrity of the fuel injection system, which often utilizes a Bosch in-line injection pump, and ensuring the glow plug system is functioning correctly for reliable cold starts.
Maintenance context for this vehicle involves monitoring the turbocharger and the cooling system. Because these older turbodiesel models were designed for longevity, they are often used as high-mileage commuters or enthusiast-owned classics. Owners should pay close attention to vacuum-operated controls and the mechanical governor components common in 1980s diesel technology. Given that specific technical documentation for the ‘617 951 H’ engine code variant is specialized, broader engine family service manuals for the OM617 series are the recommended starting point for maintenance procedures.
Recall, TSB, and manufacturer communication notes
Official recall/TSB research was not included in this draft yet. Owners should verify current open recalls by checking their specific Vehicle Identification Number (VIN) through official Mercedes-Benz channels or the NHTSA website.
Common questions about this vehicle’s diesel oil and maintenance
What is the engine oil capacity for my 1983 300SD?
The capacity is 7.9 quarts when performing an oil change with a filter replacement. If your model has an oil cooler that was drained, you may need additional oil.
What viscosity should I use for cold weather?
For temperatures above -25°C, AMSOIL lists 5W-30, 5W-40, or 5W-50. For all other temperatures, 0W-30 and 0W-40 are recommended.
Can I use any antifreeze in my Mercedes diesel?
The AMSOIL lookup lists several options, including a unique poly-organic acid (OAT) formulation. It is important to ensure compatibility with all cooling system metals and gaskets.
How often should I treat my diesel fuel?
Using additives like AMSOIL Diesel Injector Clean can help maintain injectors and lubricate pumps, which is vital for older diesel systems.
What torque spec is needed for the oil drain plug?
The confirmed torque specification for the oil drain plug is 20 ft/lbs.
Does my vehicle have any active NHTSA recalls?
NHTSA recall research returned no records for this specific year, make, and model combination. However, you should always verify by VIN as applicability depends on production date and equipment.
Disclaimer: This information is derived from provided source data. Always consult your vehicle’s owner manual or a certified professional before performing maintenance.