What oil does a 1982 Cadillac Eldorado 5.7L Diesel take?
For the 1982 Cadillac Eldorado with the 5.7L 8-cylinder Engine Code [N] Diesel, the required oil viscosity depends on ambient temperatures: 10W-30 is used below 16°C, 15W-40 between -18 to 16°C, and 30 is preferred for continuous driving above 0°C. The engine oil capacity is 7 quarts with a filter change. AMSOIL recommends using Signature Series or Heavy-Duty synthetic diesel oils for optimal protection.
AMSOIL product recommendations
Based on the vehicle specifications, the following AMSOIL products are recommended for your maintenance needs:
Engine Oil Options
| Product Name | Part Code |
|---|---|
| AMSOIL Signature Series 10W-30 100% Synthetic Max-Duty Diesel Oil | DTTQT-EA |
| AMSOIL 10W-30 Heavy-Duty 100% Synthetic Diesel Oil | ADNQT-EA |
| AMSOIL Signature Series 5W-30 100% Synthetic Max-Duty Diesel Oil | DHDQT-EA |
Oil Filter
| Product Name | Part Code |
|---|---|
| AMSOIL Oil Filter | EAO64-EA |
Coolant & Antifreeze
| Product Name | Part Code |
|---|---|
| AMSOIL Passenger Car & Light Truck Antifreeze & Coolant | ANTPC1G-EA |
| AMSOIL Propylene Glycol Antifreeze and Engine Coolant | ANT1G-EA |
Automatic Transmission Fluid
| Product Name | Part Code |
|---|---|
| AMSOIL Signature Series Fuel-Efficient 100% Synthetic ATF | ATLPK-EA |
| AMSOIL OE Fuel-Efficient 100% Synthetic ATF | OTLQT-EA |
Differential Lubricant (Front)
| Product Name | Part Code |
|---|---|
| AMSOIL SEVERE GEAR® 80W-90 100% Synthetic Gear Lube | AGLPK-EA |
| AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube | SVGPK-EA |
Engine Oil Specifications and Details
Proper lubrication is critical for the longevity of the 5.7L diesel engine. Always verify your current oil level after a refill.
Oil Viscosity Guide
| Temperature Range | Recommended Viscosity |
|---|---|
| Below 16°C | 10W-30 |
| -18 to 16°C | 15W-40 |
| Above 0°C (Continuous Driving) | 30 |
Capacity and Torque Specs
- Oil Capacity: 7 quarts (with filter replacement).
- Oil Drain Plug Torque: 30 ft/lbs.
- Oil Grade: CF.
Transmission and Differential Specifications
The automatic transmission in this vehicle requires specific attention to fluid type and capacity.
Automatic Transmission (THM325-4L)
- Specification Note: The manufacturer’s Technical Service Bulletin has updated the specification from Dexron II or III to Dexron VI.
- Initial Fill Capacity: 3.2 quarts (does not include differential).
- Total Fill Capacity: 11 quarts for the 4-speed THM325-4L.
Front Differential
- Specification: GL-5 All TEMPS….80W-90.
- Capacity: Front 3.2 pints.
Cooling System Specifications
Maintaining proper cooling is essential for diesel engine efficiency and component longevity.
| Detail | Specification |
|---|---|
| Capacity | 18.5 quarts |
Coolant Options: AMSOIL offers a 50/50 pre-mix ethylene glycol formulation (ANTPC1G-EA) or a concentrated propylene glycol option (ANT1G-EA) which requires mixing with distilled or high-quality water.
Common diesel oil-related concerns and how AMSOIL products may help
| Concern | Why it matters | AMSOIL Product | How it may help | Limitation |
|---|---|---|---|---|
| Engine Wear | Diesel engines face high pressure and friction. | Signature Series Diesel Oil | Delivers up to 6X more wear protection. | Requires regular maintenance. |
| Contaminants | Small particles can cause abrasive wear. | AMSOIL Oil Filter (EAO64-EA) | 99% efficiency at 20 microns. | Filter must be replaced per interval. |
| Extreme Temperatures | Viscosity changes can affect lubrication. | Heavy-Duty Synthetic Diesel Oil | Excels in extreme temperatures. | Not confirmed from source data for all ranges. |
Diesel maintenance notes for this vehicle
Based on the technical research, owners of this 5.7L diesel should prioritize:
- Fuel System Integrity: Given the age and engine type, monitoring fuel system components is vital.
- Filtration: Ensure high-quality diesel-specific filtration to prevent wear.
- Cooling Efficiency: Check for leaks or cooling system degradation regularly.
Recall, TSB, and manufacturer communication notes
NHTSA research indicates the following official communications for the 1982 Cadillac Eldorado:
- Fuel System Recall: Some fuel filters were produced with incorrect threaded fittings, which could lead to gasoline leaks and potential fire hazards.
- Vehicle Speed Control: Incorrect accelerator cable brackets may cause cruise control servo rods to bind.
- Injection Pump Issue: A governor weight retainer in the injection pump may fail, potentially causing the throttle valve to stick.
Note: Always verify open recalls by using your specific VIN through an authorized dealer or the NHTSA website.
Common maintenance concerns for this vehicle
Based on owner reports and historical context, consider these areas:
- Engine Stalling: Some owners have reported unexpected stalling during operation.
- Fuel System Issues: Reports of carburetor failure (in gasoline variants) or fuel system concerns are noted in general research.
- C.V. Joint Failure: Historical complaints mention potential power train/joint issues.
Note: NHTSA complaints are owner reports and should not be treated as verified defects.
About this vehicle
The 1982 Cadillac Eldorado represents a specific era in General Motors’ luxury division history. During the early 1980s, GM explored diesel technology to improve fuel economy, though these engines often required specialized maintenance compared to their gasoline counterparts.
This 5.7L V8 diesel variant (Engine Code [N]) is part of a period where Cadillac was transitioning its lineup and exploring diverse powertrain options to meet changing market demands. Owners should be aware that managing an early 1980s diesel luxury vehicle often requires focusing on fuel system integrity, glow plug operation, and specialized diesel lubricants. Because this is a vintage diesel engine, maintenance focus typically shifts toward checking for vacuum leaks, cooling system efficiency, and the condition of diesel-specific filtration components.
Technical details regarding specific performance specifications should be verified through specialized service manuals, as historical data focuses on the broader evolution of the Cadillac brand. Owners often research common failure points of early 1980s GM diesel engines to ensure long-term reliability.
Common questions about this vehicle’s diesel oil and maintenance
How much oil does my 1982 Eldorado 5.7L Diesel take?
It takes 7 quarts of oil when performing a change that includes the filter.
What is the recommended viscosity for my Cadillac diesel?
The AMSOIL lookup suggests 10W-30 for temperatures below 16°C, 15W-40 for -18 to 16°C, and 30 for continuous driving above 0°C.
Can I use Dexron III in my transmission?
The manufacturer’s Technical Service Bulletin has updated the specification from Dexron II or III to Dexron VI.
What should I do about the fuel filter recall?
If your vehicle is affected by the incorrect threaded fitting recall, you should have the filters replaced with the correct versions to prevent leaks. Verify via VIN.
Does AMSOIL offer a complete oil change kit for this engine?
Yes, AMSOIL offers kits including Signature Series or Heavy-Duty synthetic diesel oil paired with an AMSOIL Oil Filter (EAO64-EA).
How often should I change my coolant?
While specific intervals aren’t listed in the source, AMSOIL products like ANTPC1G-EA provide protection for up to 150,000 miles or 5 years.
Disclaimer: This information is derived from provided manufacturer and NHTSA data. Always consult your vehicle’s owner manual or a certified mechanic before performing maintenance. Verify all recalls using your VIN.