What oil does a 1980 Cadillac Seville 5.7L Diesel take?
For the 1980 Cadillac Seville with the 5.7L 8-cylinder Engine Code [N] Diesel, the required oil capacity is 7 quarts (including filter change). Recommended viscosities include 10W-30 for temperatures below 16°C, 15W-40 for -18 to 16°C, and 30 for temperatures above 0°C. AMSOIL recommends using Signature Series 10W-30 Max-Duty Diesel Oil and the EAO64-EA Oil Filter.
AMSOIL product recommendations
The following AMSOIL products are recommended for your 1980 Cadillac Seville 5.7L Diesel based on the provided lookup data.
Engine Oil Options
| Product Name | Viscosity | Part Code |
|---|---|---|
| Signature Series Max-Duty Synthetic Diesel Oil | 10W-30 | DTTQT-EA |
| Signature Series Max-Duty Synthetic Diesel Oil | 5W-30 | DHDQT-EA |
| Heavy-Duty 100% Synthetic Diesel Oil | 10W-30 | ADNQT-EA |
Oil Specification: CF
Oil Filter
| Product Name | Part Code |
|---|---|
| AMSOIL Oil Filter | EAO64-EA |
Transmission & Gear Fluids
| Product Name | Part Code |
|---|---|
| Signature Series Fuel-Efficient Synthetic ATF | ATLPK-EA |
| OE Fuel-Efficient Synthetic ATF | OTLQT-EA |
| SEVERE GEAR® 80W-90 Synthetic Gear Lube | AGLPK-EA |
Coolant & Antifreeze
| Product Name | Part Code |
|---|---|
| Passenger Car & Light Truck Antifreeze/Coolant | ANTPC1G-EA |
| Propylene Glycol Antifreeze and Engine Coolant | ANT1G-EA |
Engine Oil Specifications & Details
Proper lubrication is critical for the high-compression 5.7L diesel engine found in this Cadillac Seville. Always verify your specific operating temperature to select the correct viscosity.
Oil Viscosity Guide
| Temperature Range | Recommended Viscosity |
|---|---|
| Below 16°C | 10W-30 |
| -18 to 16°C | 15W-40 |
| Above 0°C (Preferred for continuous driving) | 30 |
Engine Oil Capacity & Torque
| Metric | Value |
|---|---|
| Capacity (with filter) | 7 quarts |
| Oil Drain Plug Torque | 30 ft/lbs |
Note: After refilling, always check the oil level.
Automatic Transmission Specifications
The AMSOIL lookup note references a technical service bulletin from the manufacturer updating specifications from Dexron II or III to Dexron VI for this application.
| Application | Capacity |
|---|---|
| 3 speed THM325 Total Fill | 12 quarts |
| Initial Fill | 3.2 quarts |
Note: The final drive is serviced separately.
Coolant Capacity Details
| Configuration | Capacity |
|---|---|
| California | 15.3 quarts |
| With HD Cooling | 18.5 quarts |
| With O HD Cooling | 17.4 quarts |
Diesel maintenance notes for this vehicle
Maintaining a 1980s GM diesel engine requires attention to specific systems that differ from gasoline counterparts. Owners should prioritize the following:
- Fuel System Integrity: Diesel engines are highly sensitive to fuel quality and system leaks.
- Glow Plug Functionality: Essential for reliable starting in cooler temperatures.
- Cooling System Efficiency: High-compression diesel engines require robust thermal management.
- Oil Filtration: Using high-efficiency filters like the EAO64-EA can help manage small, wear-causing contaminants.
Common diesel oil-related concerns and how AMSOIL products may help
| Concern | Why it matters | AMSOIL Product | How it may help | Limitation |
|---|---|---|---|---|
| Engine Wear | High compression increases friction. | DTTQT-EA | Delivers up to 6X more wear protection. | Requires proper service intervals. |
| Extreme Temperatures | Viscosity changes can affect lubrication. | DHDQT-EA | Excels in extreme temperatures. | Not a mechanical repair. |
| Contaminants | Small particles cause engine damage. | EAO64-EA | 99% efficiency at 20 microns. | Must be replaced regularly. |
Common maintenance concerns for this vehicle
Based on the vehicle profile, owners of early 1980s GM diesel vehicles should consider these practical checks:
- Injection Timing: Critical for engine performance and efficiency.
- Diesel-Specific Filtration: Ensure fuel filtration meets requirements to prevent injector issues.
- Thermal Management: Monitor cooling system health due to the high thermal demands of a 5.7L diesel.
Recall, TSB, and manufacturer communication notes
NHTSA recall research for the 1980 Cadillac Seville identified one record:
- Campaign 80V003000: Regarding the automatic transmission gear position indication (PRNDL). Two screws securing the shift linkage bracket may loosen and fall out, potentially causing the indicated gear to differ from the actual gear. The remedy is for a dealer to securely tighten these screws.
Note: Always verify open recalls by VIN through an authorized dealer or the NHTSA website.
About this vehicle
The 1980 Cadillac Seville represents a unique era in General Motors’ history. While the Seville is historically recognized as a premium, mid-size luxury model, this specific iteration features the 5.7L 8-cylinder diesel engine (Engine Code N). This inclusion of a diesel powerplant marked a distinct departure from Cadillac’s primary legacy of high-performance gasoline V8 engines.
Owners of this vehicle should approach technical specifications with caution, as maintenance routines for GM diesel vehicles differ significantly from the gasoline-powered Cadillacs of the same era. Researching diesel-specific requirements—such as fuel system integrity and glow plug functionality—is essential for long-term reliability. Because this model belongs to the ‘GM Diesel’ category, specialized service manuals or GM-specific diesel documentation are recommended for verifying technical details like injection timing and thermal management needs.
Common questions about this vehicle’s diesel oil and maintenance
How much oil does my 1980 Cadillac Seville 5.7L Diesel take?
It takes 7 quarts of oil when performing a service that includes the filter change.
What is the best viscosity for my diesel engine?
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 synthetic oil in this diesel engine?
Yes, AMSOIL offers several synthetic options, such as the Signature Series 10W-30, which is designed for max-duty diesel applications.
What should I check regarding my transmission?
The manufacturer has updated specifications from Dexron II/III to Dexron VI. Ensure you use a compatible fluid like ATLPK-EA or OTLQT-EA.
How often should I change my coolant?
While specific intervals aren’t listed, AMSOIL products like ANTPC1G-EA provide protection for up to 150,000 miles or 5 years.
Is there a known recall for my 1980 Seville?
NHTSA research indicates a recall regarding the automatic transmission shift linkage bracket screws. You should verify your specific VIN with a dealer to confirm if this applies to your vehicle.
Disclaimer: All information is derived from provided source data. Please consult your owner’s manual or an official service guide to ensure compatibility before performing maintenance.