What oil does a 1985 Pontiac Parisienne 5.7L Diesel take?
For the 1985 Pontiac Parisienne with the 5.7L 8-cylinder Engine Code [N] Diesel, the recommended oil viscosity depends on ambient temperature: 10W-30 for temperatures below 16°C, 15W-40 for -18 to 16°C, and 30 weight is preferred for continuous driving above 0°C. The engine requires a capacity of 7 quarts with a filter change. AMSOIL recommends using Signature Series or Heavy-Duty synthetic diesel oils for superior protection.
AMSOIL product recommendations
Based on the vehicle specifications, AMSOIL provides several high-performance lubrication options to maintain engine health and efficiency.
Engine Oil Recommendations
| Product Name | Viscosity | Product Code |
|---|---|---|
| AMSOIL Signature Series 100% Synthetic Max-Duty Diesel Oil | 10W-30 | DTTQT-EA |
| AMSOIL 10W-30 Heavy-Duty 100% Synthetic Diesel Oil | 10W-30 | ADNQT-EA |
| AMSOIL Signature Series 100% Synthetic Max-Duty Diesel Oil | 5W-30 | DHDQT-EA |
Oil Filter Recommendation
| Product Name | Product Code |
|---|---|
| AMSOIL Oil Filter [1] | EAO64-EA |
Coolant & Transmission Fluid
| Component | Product Name | Product Code |
|---|---|---|
| Coolant | AMSOIL Passenger Car & Light Truck Antifreeze & Coolant | ANTPC1G-EA |
| Coolant | AMSOIL Propylene Glycol Antifreeze and Engine Coolant | ANT1G-EA |
| ATF | AMSOIL Signature Series Fuel-Efficient 100% Synthetic ATF | ATLPK-EA |
| ATF | AMSOIL OE Fuel-Efficient 100% Synthetic ATF | OTLQT-EA |
Engine Oil Specifications & Details
Proper lubrication is critical for the longevity of the 5.7L diesel engine. Always verify your specific operating conditions against the viscosity guidelines below.
Oil Viscosity Guide
| Condition | Recommended Viscosity |
|---|---|
| Below 16°C | 10W-30 |
| -18 to 16°C | 15W-40 |
| Above 0°C (Continuous Driving) | 30 |
Oil Grade: CF
Capacity and Torque Specs
| Metric | Specification |
|---|---|
| Oil Capacity (with filter) | 7 quarts |
| Oil Drain Plug Torque | 30 ft/lbs |
Note: Always check the oil level after refilling.
Automatic Transmission Fluid Specifications
The 1985 Parisienne utilizes several transmission types. Note that manufacturer technical service bulletins have updated specifications for these units.
Transmission Type & Capacity
| Transmission Model | Total Fill Capacity | Initial Fill |
|---|---|---|
| THM200C (3-speed) | 9.4 quarts | 3.5 quarts |
| THM200-4R (4-speed) | 11 quarts | 5 quarts |
| THM700-R4 (4-speed) | 10.9 quarts | 5 quarts |
Important Note: For these applications, the manufacturer’s Technical Service Bulletin has updated the specification from Dexron II or III to Dexron VI.
Diesel maintenance notes for this vehicle
- Coolant Capacity: The cooling system holds approximately 18 quarts.
- Filter Efficiency: Using a high-quality filter like the AMSOIL EAO64-EA provides 99 percent filtering efficiency at 20 microns, which helps reduce engine wear.
- Air Filter: No specific recommendations available from source data.
- Oil Vapor Filter: No specific recommendations available from source data.
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. |
| Extreme Temperatures | Viscosity changes can affect lubrication. | Synthetic Diesel Oils | Excels in extreme temperatures and maintains proper viscosity. | Must match ambient temp requirements. |
| Contaminants | Small particles cause abrasive wear. | EAO64-EA Filter | Provides 99% efficiency at 20 microns. | Must be replaced per interval. |
Common maintenance concerns for this vehicle
Based on historical data and research, owners of mid-1980s GM diesel vehicles should consider the following:
- Fuel System Integrity: Diesel engines require high-quality fuel filtration. Regular inspection of fuel lines and filters is recommended.
- Cooling System Maintenance: Large displacement diesel engines require robust cooling systems to manage heat effectively.
- Gasket and Seal Aging: As these vehicles age, specialized gaskets or seals may require inspection due to material degradation over time.
Recall, TSB, and manufacturer communication notes
NHTSA research indicates several historical communications for the 1985 Pontiac Parisienne. Always verify open recalls using your specific VIN through an official dealer or the NHTSA website.
Official Recalls
- Fuel System: A recall (Campaign 06E043000) was noted regarding certain replacement fuel filters where the O-ring might not seat correctly, potentially leading to leaks.
- Oil Filter: A recall (Campaign 07E088000) involved certain FRAM Racing HP4 and HP8 oil filters that could experience gasket pliability under high heat/pressure, potentially causing oil loss.
- Cruise Control: A recall (Campaign 89V102000) addressed a nylon bushing in the cruise control servo bail that could cause unexpected engine speed increases or “dieseling.”
NHTSA Complaint Patterns
Note: NHTSA complaints are owner reports and should not be treated as verified defects.
- Power Train: Reports of transmission slipping or issues leading to overheating.
- Vehicle Speed Control: Reports of cruise control causing unexpected acceleration.
- Service Brakes: Reports regarding master cylinder or power booster failures.
About this vehicle
The 1985 Pontiac Parisienne represents a specific era of General Motors’ full-size sedan offerings. It was a rear-wheel-drive vehicle sold in the United States between 1983 and 1986, sharing much of its mechanical DNA with other GM full-size vehicles like the Chevrolet Caprice or Impala.
The specific 5.7L 8-cylinder diesel variant (Engine Code N) requires specialized maintenance routines compared to gasoline counterparts. Owners should prioritize fuel filtration, glow plug operation, and cooling system integrity. Because this vehicle was part of a broader GM platform strategy, many components may have cross-compatibility with other mid-1980s full-size GM vehicles, but precise fitment for diesel-specific components must be confirmed against original factory service manuals.
For modern owners or restorers, research topics should focus on the longevity of the diesel fuel system and the availability of specialized gaskets or seals that may have aged differently than gasoline engine components. Maintaining high-quality diesel fuel treatment and regular inspection of heavy-duty cooling systems is vital for these large-displacement engines.
Common questions about this vehicle’s diesel oil and maintenance
How much oil does my 5.7L Diesel Parisienne take?
It takes 7 quarts of oil when performing a change that includes the filter replacement.
What is the correct oil viscosity for cold weather?
For temperatures below 16°C, 10W-30 is recommended. If temperatures are between -18 and 16°C, 15W-40 is appropriate.
Can I use Dexron III in my automatic transmission?
The AMSOIL lookup note references a manufacturer Technical Service Bulletin stating that the specification has been updated from Dexron II or III to Dexron VI for these transmissions.
How often should I change my coolant?
While specific intervals aren’t listed, AMSOIL products like the Propylene Glycol Antifreeze offer protection for up to 150,000 miles or 5 years in passenger cars/light trucks.
What should I do if my cruise control acts up?
NHTSA recall data (Campaign 89V102000) noted a bushing issue in the cruise control servo bail. You should verify your VIN to see if this recall applies to your vehicle.
Does AMSOIL offer heavy-duty diesel oil for this engine?
Yes, AMSOIL lists several options including the Signature Series 10W-30 and 5W-30 Max-Duty Diesel Oils, as well as the 10W-30 Heavy-Duty 100% Synthetic Diesel Oil.
Disclaimer: This information is derived from provided source data. Always consult your owner’s manual or a certified mechanic to confirm specifications and maintenance requirements for your specific vehicle.