For the 1985 Chevrolet S10 Pickup with the 2.2L 4-cylinder Diesel engine (Engine Code S), the oil capacity is 5.5 quarts (including filter replacement). The preferred viscosity for temperatures below 38°C is SAE 10W-30. AMSOIL recommends using Signature Series 10W-30 100% Synthetic Max-Duty Diesel Oil for outstanding extreme-pressure protection.
What oil does a 1985 Chevrolet S10 2.2L Diesel take?
The engine requires an oil with the CG-4 specification. Depending on your ambient operating temperatures, you should select one of the following viscosities: SAE 10W-30 is preferred for temperatures below 38°C; 15W-40 is suitable for temperatures above -12°C; and 30 weight oil is recommended for temperatures above 0°C.
AMSOIL product recommendations
Based on the AMSOIL lookup data, the following products are recommended for your 1985 Chevrolet S10 Pickup diesel engine and drivetrain components:
Engine Oil Options
| Product Name | Viscosity | Part 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 |
Transmission & Gear Fluids
| Component | Product Name | Part Code |
|---|---|---|
| Automatic Transmission | Signature Series Fuel-Efficient ATF | ATLPK-EA |
| Automatic Transmission | OE Fuel-Efficient ATF | OTLQT-EA |
| Manual Transmission | SEVERE GEAR® 80W-90 | AGLPK-EA |
| Manual Transmission | SEVERE GEAR® 75W-90 | SVGPK-EA |
| Manual Transmission | SEVERE GEAR® 75W-110 | SVTPK-EA |
Coolant Options
| Product Name | Type | Part Code |
|---|---|---|
| Passenger Car & Light Truck Antifreeze | 50/50 Pre-mix (OAT) | ANTPC1G-EA |
| Propylene Glycol Antifreeze | Concentrate | ANT1G-EA |
Engine Oil Specifications
| Specification | Details |
|---|---|
| Oil Grade | CG-4 |
Engine Oil Capacity & Torque
| Measurement | Value |
|---|---|
| Capacity (with filter) | 5.5 quarts |
| Oil Drain Plug Torque | 12-20 ft/lbs |
Note: Always check the oil level after refilling to ensure accuracy.
How much transmission fluid does it take?
For vehicles equipped with the 4-speed THM700-R4 automatic transmission, the total fill capacity is 11.2 quarts, while the initial fill is 5 quarts. Note that manufacturer technical service bulletins have updated this specification from Dexron II or III to Dexron VI.
Automatic Transmission Details
| Specification | Note |
|---|---|
| Transmission Type | THM700-R4 |
| Updated Spec | Dexron VI (per manufacturer TSB) |
Manual Transmission Details
| Specification | Value |
|---|---|
| Gear Lube Spec | GL-5 (All Temps) |
| Capacity | 8 pints |
| Canada Note | Use 80W in Canada |
Coolant and Maintenance Specifications
The cooling system capacity varies based on the specific configuration. For models with ‘O AC’, the capacity is 11.6 quarts, while ‘AC’ configurations require 12.2 quarts.
Coolant Capacity
| Configuration | Capacity |
|---|---|
| With O AC | 11.6 quarts |
| With AC | 12.2 quarts |
Filter Recommendations
Oil Filter: No specific recommendations available from the source data.
Air Filter: No specific recommendations available from the source data.
Oil Vapor Filter: No specific recommendations available from the 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. | DTTQT-EA | Delivers up to 6X more wear protection. | Requires regular oil changes. |
| Extreme Temperatures | Viscosity changes can affect lubrication. | DHDQT-EA | Excels in extreme temperatures. | Not a substitute for proper viscosity selection. |
| Gear/Axle Wear | Heavy loads cause heat and friction in gears. | SVGPK-EA | Controls thermal runaway and protects against wear. | Diagnosis of mechanical failure may be required. |
Diesel maintenance notes for this vehicle
When maintaining a 1985 diesel variant, owners should prioritize high-quality fuel filtration. Given the age of these vehicles, it is highly recommended to inspect aging rubber components, vacuum lines, and electrical connections. If this is a diesel configuration, monitoring the glow plug system (if applicable) is essential for reliable cold starts.
Common maintenance concerns for this vehicle
- Fuel System: Owners should regularly inspect fuel delivery systems and lines.
- Cooling System: Monitor for leaks or degradation of hoses and gaskets common to older GM platforms.
- Tires/Suspension: Inspect tires and suspension bushings due to the vehicle’s age.
Recall, TSB, and manufacturer communication notes
NHTSA research indicates one recall record for this model year:
- Campaign 06E043000: Related to the gasoline fuel system (specifically replacement fuel filters). Note that while this is a gasoline-related recall, it highlights the importance of inspecting all fuel connections.
Disclaimer: Always verify open recalls by using your specific VIN through official manufacturer or NHTSA channels.
About this vehicle
The 1985 Chevrolet S-10 belongs to the first generation of Chevrolet’s compact pickup trucks, a line that was instrumental in bringing domestic compact pickups to the American market. This model is commonly associated with a versatile, light-duty platform used for utility work, light hauling, and personal transportation.
While standard historical records for this era typically associate the S-10 with gasoline engines, this specific documentation covers the 2.2L 4-cylinder Diesel configuration (Engine Code S). Owners of these vintage diesel variants should be prepared for a mechanical layout that prioritizes simplicity but may require specific attention to aging rubber components and fuel delivery systems common to older GM compact platforms.
The S-10 shares its lineage with the GMC S-15 and paved the way for later models like the Chevrolet Colorado. Because this vehicle falls within the era of ‘Rounded Line’ design principles, maintenance often focuses on preserving the integrity of aging cooling systems and ensuring reliable diesel operation through proper filtration.
Common questions about this vehicle’s diesel oil and maintenance
What is the engine oil capacity for my 1985 S10 Diesel?
The capacity is 5.5 quarts when performing a service that includes a filter change.
Which AMSOIL oil provides the best wear protection for this engine?
The Signature Series 10W-30 (DTTQT-EA) is noted for delivering 6X more wear protection based on third-party testing.
What viscosity should I use in cold weather?
For temperatures below 38°C, SAE 10W-30 is preferred. For even colder conditions, the AMSOIL lookup lists 5W-30 options like DHDQT-EA.
Does my automatic transmission need a specific fluid?
The AMSOIL lookup note references an update from Dexron II/III to Dexron VI per a manufacturer TSB. For this application, the lookup lists Signature Series Fuel-Efficient ATF.
How much gear lube is needed for the manual transmission?
The capacity for the manual transmission is 8 pints. AMSOIL recommends products like SEVERE GEAR® 75W-90.
How can I verify if my vehicle has active recalls?
While NHTSA data is provided here, you should always contact a local dealer or use the official NHTSA website to check for open recalls using your specific Vehicle Identification Number (VIN).
Disclaimer: This information is derived from provided source data. Always consult your owner’s manual and verify all specifications before performing vehicle maintenance.