For the 1983 Pontiac Grand Prix with the 5.7L 8-cylinder Diesel 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 Signature Series 10W-30 Max-Duty Diesel Oil for superior protection.
What oil does a 1983 Pontiac Grand Prix 5.7L Diesel take?
The engine requires an oil with a CF grade specification. Depending on your operating environment, you should select the appropriate viscosity: 10W-30 for temperatures below 16°C, 15W-40 for temperatures between -18 to 16°C, or a 30 weight oil for continuous driving in temperatures above 0°C.
AMSOIL product recommendations
Based on the vehicle specifications, AMSOIL offers several high-performance lubrication and filtration options to maintain your diesel engine and drivetrain.
Engine Oil Options
| Product Name | Viscosity | 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 |
Filtration & Coolant
| Component | Product Name | Code |
|---|---|---|
| Oil Filter | AMSOIL Oil Filter | EAO64-EA |
| Antifreeze | Passenger Car & Light Truck | ANTPC1G-EA |
| Antifreeze | Propylene Glycol | ANT1G-EA |
Transmission Fluid
| Product Name | Code |
|---|---|
| AMSOIL Signature Series Fuel-Efficient ATF | ATLPK-EA |
| AMSOIL OE Fuel-Efficient ATF | OTLQT-EA |
Engine Oil Specifications
| Detail | Specification/Value |
|---|---|
| Oil Grade | CF |
| Drain Plug Torque | 20 ft/lbs |
Engine Oil Capacity
| Condition | Capacity |
|---|---|
| With Filter Change | 7 quarts |
Note: Always check the oil level after refilling.
How much transmission fluid does it take?
Capacity varies significantly depending on your specific automatic transmission model. For the THM200-4R, the total fill is 11 quarts with a 5-quart initial fill. The THM700-R4 also requires an 11-quart total fill and 5-quart initial fill. The THM350C requires a 10-quart total fill and 3-quart initial fill, while the THM200C requires a 9.4-quart total fill and 3.5-quart initial fill.
Transmission Fluid Capacities
| Transmission Model | Total Fill | Initial Fill |
|---|---|---|
| THM200-4R | 11 quarts | 5 quarts |
| THM700-R4 | 11 quarts | 5 quarts |
| THM350C | 10 quarts | 3 quarts |
| THM200C | 9.4 quarts | 3.5 quarts |
Note: Manufacturer technical service bulletins indicate that specifications for these units have been updated from Dexron II or III to Dexron VI.
Coolant and Air Filter Requirements
Coolant Capacity
The cooling system capacity is 17.4 quarts. AMSOIL offers both a pre-mixed Ethylene glycol 50/50 formulation and a concentrated Propylene Glycol option that requires mixing with distilled or high-quality water.
Air Filter Information
No specific air filter or oil vapor filter recommendations are available from the source data for this vehicle.
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. | DTTQT-EA | Delivers up to 6X more wear protection. | Requires regular oil changes. |
| Extreme Temperatures | Viscosity changes can affect lubrication. | ADNQT-EA | Excels in extreme temperatures. | Not confirmed for all ranges. |
| Contaminants | Small particles cause abrasive wear. | EAO64-EA | 99% efficiency at 20 microns. | Filter must be replaced per interval. |
Diesel maintenance notes for this vehicle
- Fuel System Integrity: Diesel engines of this era are sensitive to fuel quality; diligent attention to fuel filters and water separators is recommended.
- Thermal Management: Ensuring the cooling system is robust is critical for heavy-duty engine variants.
- Verification: Due to GM’s “badge engineering” during this period, specific diesel components like injectors or glow plugs should be verified against factory build sheets.
Recall, TSB, and manufacturer communication notes
NHTSA research indicates the following official communications for the 1983 Pontiac Grand Prix:
- Oil Filter Recall (Campaign 07E088000): Certain Honeywell FRAM Racing Brand HP4 and HP8 oil filters may have gaskets that become too pliable under high heat/pressure, potentially causing leaks and fire risks.
- Brake Line Leak (Campaign 83V106000): The master cylinder rear brake pipe may develop a leak due to chafing on the air cleaner resonator bracket.
Disclaimer: Always verify open recalls by VIN through an authorized dealer or the NHTSA website.
About this vehicle
The 1983 Pontiac Grand Prix represents a specific era in General Motors’ history where the model line was transitioning through various market segments. Historically, the Grand Prix began as a full-size performance coupe and eventually moved into the intermediate personal luxury car segment.
This specific variant features the 5.7L Diesel engine with the ‘N’ code. Owners of this variant should be aware that while the Grand Prix nameplate is well-documented, the application of a 5.7L diesel engine may require additional verification against original factory build sheets to confirm exact displacement and performance specifications. Because this vehicle falls into a period where GM utilized various platforms to address fuel economy and market shifts, maintenance enthusiasts should identify whether the vehicle utilizes a front-wheel drive or rear-wheel drive configuration, as this impacts drivetrain service requirements.
Common questions about this vehicle’s diesel oil and maintenance
What is the oil capacity for my 1983 Grand Prix 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 extreme cold?
For temperatures below 16°C, the AMSOIL lookup recommends a 10W-30 viscosity, such as DTTQT-EA.
Can I use Dexron III in my transmission?
The AMSOIL lookup notes that for the THM automatic transmissions, the specification has been updated from Dexron II or III to Dexron VI per a manufacturer Technical Service Bulletin.
How often should I change my coolant?
AMSOIL offers protection up to 150,000 miles or 5 years for Passenger Car & Light Truck formulations, but you should follow your specific vehicle’s service manual.
What should I do about the brake pipe chafing issue?
NHTSA recall information suggests inspecting the master cylinder rear brake pipe for signs of wear caused by the air cleaner resonator bracket. If wear is found, the pipe may need replacement.
Does AMSOIL provide diesel-specific additives?
Yes, AMSOIL offers various diesel products including Cetane Boost and Injector Cleaners to help maintain fuel system performance.
Verification Disclaimer: While this article is based on provided technical data, always consult your owner’s manual or a certified mechanic before performing maintenance.