For the 1987 Mercedes Benz 300SDL with the 3.0L 6-cylinder Engine Code 603.961 X Diesel Turbo, the engine oil capacity is 8.5 quarts (with filter). 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) or AMSOIL 0W-40 FS 100% Synthetic European Motor Oil (EFOQT-EA) for optimal protection.
What oil does a 1987 Mercedes Benz 300SDL take?
The 1987 Mercedes Benz 300SDL (Engine Code 603.961 X) requires an oil with the AMSOIL lookup oil grade SEO41. Depending on your operating environment, you should select a viscosity that matches your local temperature ranges to ensure proper lubrication and protection.
The oil capacity is 8.5 quarts when performing a service with a filter change. Note that if your model is equipped with an oil cooler, additional oil may be required when the cooler is drained.
AMSOIL product recommendations
Based on the vehicle specifications, AMSOIL provides high-performance synthetic options for your Mercedes diesel engine and its vital systems.
Engine Oil & Filter
| Product Name | Code |
|---|---|
| AMSOIL 5W-40 FS 100% Synthetic European Motor Oil | EFMQT-EA |
| AMSOIL 0W-40 FS 100% Synthetic European Motor Oil | EFOQT-EA |
| WIX Oil Filter | 51289-EA |
Coolant & Brake Fluid
| Product Name | 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
| Product Name | Code |
|---|---|
| AMSOIL Signature Series Multi-Vehicle 100% Synthetic ATF | ATFPK-EA |
| AMSOIL OE Multi-Vehicle 100% Synthetic ATF | OTFQT-EA |
| AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid | PSFCN-EA |
Engine Oil Viscosity Selection
| Temperature Range | Recommended Viscosity |
|---|---|
| All Temperatures | 0W-30, 0W-40 |
| Above -20°C | 10W-40 |
| Above -25°C | 5W-30, 5W-40, 5W-50 |
Engine Oil Capacity and Torque Specs
- Oil Drain Plug (M14 bolt): 18 ft/lbs
- Oil Drain Plug (M12 bolt): 22 ft/lbs
- Maintenance Tip: Allow 5 minutes after refilling or turning the engine off before checking the oil level.
Automatic Transmission Fluid Specifications
For the automatic transmission (722.3), specific fill capacities must be observed to ensure correct shifting and longevity. The AMSOIL lookup note references the 722.3…AF3 specification for this application.
| Service Type | Capacity |
|---|---|
| Total Fill (4-speed 722.3) | 7.7 quarts |
| Initial Fill | 6.6 quarts |
Coolant and Brake Fluid Requirements
Proper cooling and braking performance are critical for this diesel sedan. The coolant capacity is 10.6 quarts.
Brake Fluid Notes
The AMSOIL lookup note references the following requirements for brake fluid: Use DOT 4 plus, 0009895605090109 (previously 0009895605110111, 000989080701) or products approved on MB Sheet 331.0.
Coolant Options
- AMSOIL Passenger Car & Light Truck Antifreeze: An ethylene glycol 50/50 pre-mix formulation.
- AMSOIL Propylene Glycol Antifreeze: A concentrated formula that requires mixing with distilled or high-quality water.
Diesel maintenance notes for this vehicle
Owners of the OM603 engine should pay close attention to several key areas:
- Oil Level Checks: Always allow 5 minutes after engine shutdown before checking levels.
- Turbocharger Care: As a turbocharged diesel, maintaining oil quality is vital for turbo longevity.
- Cooling System: Ensure the use of compatible coolants to protect all metals, gaskets, and hoses.
- Differential/Transfer Case: The rear capacity is noted at 2.3 pints.
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 |
|---|---|---|---|---|
| Turbocharger Protection | High heat and speed can cause oil breakdown. | EFMQT-EA | Designed for unique demands of European diesel vehicles. | Requires regular interval adherence. |
| Cold Starts | Thick oil can hinder lubrication during startup. | EFOQT-EA | Provides 0W viscosity for better flow. | Not confirmed for all extreme climates. |
| Transmission Wear | Heat and heavy use can degrade fluid. | ATFPK-EA | Withstands heavy towing and elevated temperatures. | Diagnosis required for mechanical failure. |
Common maintenance concerns for this vehicle
Based on historical research of the OM603 engine family, owners should consider:
- Cylinder Head Integrity: Early U.S. models (1986-1987) featured diesel particulate filters/trap oxidizers that could lead to aluminum cylinder head failures due to heat.
- Fuel System Maintenance: The Bosch M in-line injection pump and glow plug operation are standard areas of focus for classic diesel owners.
- Valve Clearance: This engine utilizes hydraulic bucket tappets for automatic adjustment, but general top-end health is a common research topic.
Recall, TSB, and manufacturer communication notes
Official NHTSA recall research for the 1987 Mercedes Benz 300sdl returned no recall records. 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 depends on production date and equipment.
About this vehicle
The 1987 Mercedes-Benz 300SDL is a premium diesel sedan belonging to the W126 chassis series. The W126 generation was a highly successful S-Class lineage produced between 1979 and 1991, known for its longevity and engineering excellence. This specific model utilizes the OM603 engine family, which is a straight-6 diesel powerplant. The 300SDL features a turbocharged version of the 3.0L engine (approximately 2,996 cc).
While some research contexts categorize this vehicle under ‘Mercedes BlueTEC’, it is important to note that BlueTEC is a modern marketing name for advanced NOx reduction technologies found in much newer diesel engines. The 1987 300SDL predates the widespread implementation of these specific modern systems. Owners should verify if their specific emissions components differ from modern standards. This vehicle is commonly associated with high-mileage reliability and robust engineering, making proper lubrication essential for long-term operation.
Common questions about this vehicle’s diesel oil and maintenance
What is the engine oil capacity for a 1987 300SDL?
The capacity is 8.5 quarts with a filter change. If your model has an oil cooler, you may need more oil when draining the cooler.
Which AMSOIL oil is best for my Mercedes diesel?
AMSOIL recommends EFMQT-EA or EFOQT-EA, which are designed for the unique demands of European diesel vehicles.
How much automatic transmission fluid does it take?
For the 4-speed 722.3 transmission, the total fill is 7.7 quarts, while the initial fill is 6.6 quarts.
What torque should I use for the oil drain plug?
The torque depends on the bolt size: M14 bolts require 18 ft/lbs, and M12 bolts require 22 ft/lbs.
Does this vehicle have any active recalls?
NHTSA research returned no recall records for this model, but you should always check your specific VIN with a dealer to be certain.
Can I use any antifreeze in my Mercedes?
The AMSOIL lookup lists ANTPC1G-EA (pre-mix) or ANT1G-EA (concentrate) for this application.
Disclaimer: Not all information provided is guaranteed to be accurate for your specific vehicle. Always consult your owner’s manual or a certified mechanic before performing maintenance.