For the 1985 Chevrolet Caprice with the 5.7L 8-cylinder Diesel engine (Engine Code N), the oil capacity is 7 quarts (including filter replacement). Recommended viscosities depend on ambient temperature: 10W-30 for temperatures below 16°C, 15W-40 for -18°C to 16°C, and SAE 30 is preferred for temperatures above 0°C. AMSOIL recommends Signature Series 10W-30 Max-Duty Diesel Oil and the EAO64-EA Oil Filter.
What oil does a 1985 Chevrolet Caprice 5.7L Diesel take?
The engine requires an oil with a CF grade specification. The appropriate viscosity is determined by your operating environment: use 10W-30 for temperatures below 16°C, 15W-40 for the range of -18°C to 16°C, and SAE 30 is preferred when temperatures are above 0°C.
AMSOIL product recommendations
Based on the vehicle lookup, the following AMSOIL products are recommended for your 1985 Chevrolet Caprice Diesel.
Engine Oil Options
| Product Name | Viscosity | Code |
|---|---|---|
| AMSOIL Signature Series Max-Duty Diesel Oil | 10W-30 | DTTQT-EA |
| AMSOIL 10W-30 Heavy-Duty Synthetic Diesel Oil | 10W-30 | ADNQT-EA |
| AMSOIL Signature Series Max-Duty Diesel Oil | 5W-30 | DHDQT-EA |
Oil Filter
| Product Name | Code |
|---|---|
| AMSOIL Oil Filter | EAO64-EA |
Coolant & Antifreeze
| Product Name | Code |
|---|---|
| AMSOIL Passenger Car & Light Truck Antifreeze/Coolant | ANTPC1G-EA |
| AMSOIL Propylene Glycol Antifreeze/Coolant | ANT1G-EA |
Automatic Transmission Fluid
| Product Name | Code |
|---|---|
| AMSOIL Signature Series Fuel-Efficient ATF | ATLPK-EA |
| AMSOIL OE Fuel-Efficient ATF | OTLQT-EA |
Engine Oil Specifications
| Parameter | Specification/Value |
|---|---|
| Oil Grade | CF |
| Viscosity (Below 16°C) | 10W-30 |
| Viscosity (-18 to 16°C) | 15W-40 |
| Viscosity (Above 0°C) | SAE 30 (Preferred) |
Engine Oil Capacity & Torque
| Component | Capacity/Torque |
|---|---|
| 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 transmission requires fluid meeting the AF6 specification. Note that manufacturer technical service bulletins have updated this specification from Dexron II or III to Dexron VI.
Transmission Capacities
| Transmission Type | Total Fill | Initial Fill |
|---|---|---|
| 4-speed THM700-R4 | 10.9 quarts | 5 quarts |
| 3-speed THM200C | 9.4 quarts | 3.5 quarts |
| 4-speed THM200-4R | 11 quarts | 5 quarts |
Coolant Specifications
The cooling system capacity is 18.5 quarts. AMSOIL offers both pre-mixed and concentrated options for this application.
| Product Type | Formulation Note |
|---|---|
| Ethylene Glycol 50/50 Pre-mix | Ready to use |
| Propylene Glycol Concentrated | Requires mixing with distilled or high-quality water |
Diesel maintenance notes for this vehicle
- Oil Filter: The AMSOIL filter (EAO64-EA) provides 99 percent filtering efficiency at 20 microns.
- Air Filter: No recommendations available from source data.
- Oil Vapor Filter: No recommendations available from source data.
- Drain Plug: Ensure the drain plug is torqued to 30 ft/lbs to prevent leaks.
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 proper service intervals. |
| Extreme Temperatures | Viscosity changes can affect lubrication. | Heavy-Duty Synthetic Diesel Oil | Excels in extreme temperatures. | Not confirmed from source data. |
| Contaminants | Small particles cause abrasive wear. | EAO64-EA Filter | Provides greater capacity for small, wear-causing contaminants. | Not confirmed from source data. |
Common maintenance concerns for this vehicle
Based on historical context and owner reports, owners of older diesel vehicles should consider the following:
- Fuel System Integrity: Diesel engines are sensitive to fuel quality and system leaks.
- Cooling Efficiency: Maintaining proper coolant levels is vital for engine longevity.
- Filtration: Sourcing heavy-duty filtration components suitable for older diesel injection systems is a common research topic.
Recall, TSB, and manufacturer communication notes
NHTSA recall research identified the following information for the 1985 Chevrolet Caprice:
- Cruise Control: A recall (Campaign 89V102000) noted a small nylon bushing in the cruise control servo bail could slip, potentially causing unexpected increases in engine speed or dieseling.
- Oil Filter Warning: While not specific to this exact model year’s original equipment, NHTSA notes a recall regarding certain replacement Honeywell Fram Racing HP4 and HP8 filters where gaskets could become pliable, leading to oil loss.
Disclaimer: Always verify open recalls by using your specific VIN through official manufacturer or NHTSA channels.
About this vehicle
The 1985 Chevrolet Caprice represents a specific era of General Motors’ full-size sedan production. Historically, the Caprice nameplate was introduced in 1965 as a luxury trim for the Impala before evolving into its own distinct series. While many enthusiasts associate the Caprice with high-performance gasoline V8 engines, this specific configuration features a 5.7L 8-cylinder diesel engine (Engine Code N).
Typical use cases for full-size Chevrolet sedans of this era included comfortable long-distance cruising and fleet service. For owners of a diesel-powered Caprice, maintenance focus shifts significantly from standard gasoline counterparts. Maintenance context for this vehicle should prioritize fuel system integrity, cooling system efficiency, and specialized diesel engine lubrication. Given the age of the vehicle, common owner research topics often include finding era-appropriate diesel fuel additives, managing glow plug reliability, and sourcing heavy-duty filtration components suitable for older diesel injection systems.
Maintenance Note: Specific oil, filter, and fluid recommendations must be verified against the owner’s manual or a certified service guide. Diesel engines require specific viscosity ratings and additive packages that differ from gasoline versions of the same vehicle model.
Common questions about this vehicle’s diesel oil and maintenance
How much oil does my 1985 Caprice 5.7L Diesel take?
It takes 7 quarts of oil when performing a change that includes the filter.
What is the preferred oil viscosity for warm weather?
For temperatures above 0°C, SAE 30 is preferred according to the AMSOIL lookup data.
Can I use Dexron III in my transmission?
The AMSOIL lookup note references that the specification has been updated from Dexron II or III to Dexron VI per a manufacturer Technical Service Bulletin.
What is the torque spec for the oil drain plug?
The oil drain plug should be torqued to 30 ft/lbs.
Does AMSOIL offer synthetic options for this diesel engine?
Yes, AMSOIL lists the Signature Series 10W-30 and 5W-30 100% Synthetic Max-Duty Diesel Oils for this application.
How do I verify if my vehicle has an active recall?
You should contact a local dealer or use the NHTSA website to check your specific VIN for any open recalls or manufacturer communications.
Disclaimer: Information provided is based on available source data. Always consult your vehicle’s owner manual and professional mechanics before performing maintenance.