For the 1980 Buick LeSabre with the 5.7L 8-cylinder Diesel engine (Engine Code N), the oil capacity is 7 quarts (including filter replacement). Recommended viscosities include 10W-30 for temperatures below 16°C, 15W-40 for -18 to 16°C, and 30 weight for continuous driving above 0°C. AMSOIL recommends using Signature Series 10W-30 Max-Duty Diesel Oil and the EAO64-EA Oil Filter.
What oil does a 1980 Buick LeSabre 5.7L Diesel take?
The 1980 Buick LeSabre 5.7L diesel engine requires an oil with a CF grade specification. Depending on your operating environment, you should select the appropriate viscosity to ensure proper lubrication and protection for this high-compression diesel application.
AMSOIL product recommendations
Based on the vehicle specifications, AMSOIL provides several high-performance lubrication options for your Buick Diesel engine and transmission systems.
Engine Oil Options
| Product Name | Viscosity | Part Code |
|---|---|---|
| AMSOIL Signature Series Max-Duty Diesel Oil | 10W-30 | DTTQT-EA |
| AMSOIL 10W-30 Heavy-Duty Diesel Oil | 10W-30 | ADNQT-EA |
| AMSOIL Signature Series Max-Duty Diesel Oil | 5W-30 | DHDQT-EA |
Oil Filter Recommendation
| 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 ATF | ATLPK-EA |
| AMSOIL OE Fuel-Efficient ATF | OTLQT-EA |
Engine Oil Specifications
| Condition | Recommended Viscosity |
|---|---|
| Below 16°C | 10W-30 |
| -18 to 16°C | 15W-40 |
| Above 0°C (Continuous Driving) | 30 |
Oil Specification: CF
Oil Capacity and Torque
| Description | Value |
|---|---|
| Total Capacity (with filter) | 7 quarts |
| Oil Drain Plug Torque | 30 ft/lbs |
Note: Always check the oil level after refilling.
How much transmission fluid does it take?
The capacity for your automatic transmission depends on which specific unit is installed in your vehicle. The AMSOIL lookup notes that specifications may have been updated from Dexron II or III to Dexron VI per manufacturer technical service bulletins.
Transmission Capacity Details
| Transmission Model | Total Fill Capacity | Initial Fill |
|---|---|---|
| THM250C | 10.8 quarts | 4 quarts |
| THM350C | 10 quarts | 3 quarts |
| THM350 | 10 quarts | 3 quarts |
| THM200C | 9.4 quarts | 3.5 quarts |
Diesel maintenance notes for this vehicle
Maintaining a vintage diesel engine requires attention to specific mechanical needs that differ from gasoline counterparts. Owners should prioritize the following:
- Fuel System Integrity: Ensure fuel filtration is optimal to prevent contamination.
- Cooling Efficiency: Monitor the cooling system closely, as thermal management is critical for diesel longevity.
- Glow Plug Operation: Verify glow plugs are functioning correctly for reliable starting.
- Oil Viscosity: Use specialized viscosities designed for high-compression diesel combustion.
Common diesel oil-related concerns and how AMSOIL products may help
Diesel engines face unique stresses. The following table outlines common concerns and how specific AMSOIL products can support engine health.
| Concern | Why it matters | AMSOIL Product | How it may help | Limitation |
|---|---|---|---|---|
| Engine Wear | High compression causes friction. | DTTQT-EA | Delivers up to 6X more wear protection. | Requires proper service intervals. |
| Contaminants | Small particles cause damage. | EAO64-EA | 99% efficiency at 20 microns. | Must be replaced regularly. |
| Extreme Temperatures | Viscosity changes affect flow. | ADNQT-EA | Excels in extreme temperatures. | Check viscosity for specific ambient temp. |
Common maintenance concerns for this vehicle
Based on the historical context of 1980s diesel Buicks, owners should consider these practical checks:
- Fuel Filtration: Diesel engines are sensitive to fuel quality; regular filter changes are essential.
- Cooling System: Check for leaks in gaskets and hoses to maintain thermal management.
- Lubrication: Ensure the oil drain plug is torqued to 30 ft/lbs to prevent leaks.
Recall, TSB, and manufacturer communication notes
Official NHTSA recall research for the 1980 Buick LeSabre returned no records at this time. However, owners should always verify open recalls by VIN, as applicability depends on specific production dates and equipment. Additionally, note that some transmission specifications for this vehicle have been updated from Dexron II or III to Dexron VI via manufacturer Technical Service Bulletins.
About this vehicle
The 1980 Buick LeSabre represents a specific era in General Motors’ history. During this period, the Buick division was positioned as a premium brand between Chevrolet and Cadillac, offering full-size vehicles including sedans, hardtops, and station wagons.
This particular model features the 5.7L 8-cylinder diesel engine (Engine Code N). Because diesel technologies of this era differ significantly from standard V8 gasoline counterparts—particularly regarding compression ratios, fuel delivery systems, and thermal management—owners must be diligent with specialized maintenance. Typical use cases for a full-size Buick of this vintage include comfortable long-distance cruising and heavy-duty passenger transport.
Maintenance schedules for this vehicle are heavily dictated by diesel-specific requirements rather than gasoline standards. It is highly recommended that owners verify exact engine family details through specialized diesel service manuals or original owner documentation to ensure all fluid specifications meet the unique needs of the 5.7L Diesel engine.
Common questions about this vehicle’s diesel oil and maintenance
What is the oil capacity for my 1980 Buick LeSabre diesel?
The capacity is 7 quarts when performing an oil change with a new filter. Always check the level after refilling.
Which AMSOIL oil is best for high-wear protection?
The Signature Series 10W-30 (DTTQT-EA) is designed to deliver up to 6X more wear protection based on third-party testing.
What should I use for the transmission fluid?
The AMSOIL lookup lists Signature Series Fuel-Efficient ATF or OE Fuel-Efficient ATF, noting that specifications may have updated to Dexron VI.
How much coolant does the engine hold?
The cooling system capacity is 18.5 quarts.
What torque spec should I use for the oil drain plug?
The oil drain plug should be tightened to 30 ft/lbs.
Are there any recalls for my 1980 Buick LeSabre?
NHTSA research returned no specific recall records, but you should always verify your VIN with a dealer to check for open recalls.
Disclaimer: Not confirmed from source data. Always verify all technical specifications using a dedicated service manual or the vehicle’s original documentation before performing maintenance.