For the 1986 GMC Jimmy with the 6.2L 8-cylinder Diesel engine (Code C), the oil capacity is 7 quarts with a filter change. The preferred viscosity for temperatures above -18°C is SAE 10W-30. AMSOIL recommends using Signature Series 10W-30 100% Synthetic Max-Duty Diesel Oil (DTTQT-EA) paired with an AMSOIL Oil Filter (EAO24-EA) for optimal protection.
What oil does a 1986 GMC Jimmy 6.2L Diesel take?
The 1986 GMC Jimmy 6.2L diesel engine requires an oil with the CF-4 specification. Depending on your ambient operating temperatures, you should select the appropriate viscosity from the following list: 5W-30 (Below 16°C), 10W-30 (Above -18°C, preferred), 15W-40 (Above -12°C), 20W-20 (Above -7°C), or 30 (Above 4°C).
The engine oil capacity for the 1986 GMC Jimmy 6.2L diesel is 7 quarts when performing a service that includes replacing the oil filter. It is important to check the oil level after refilling to ensure accuracy.
AMSOIL product recommendations
Below are the recommended AMSOIL products for your 1986 GMC Jimmy 6.2L Diesel, categorized by system component.
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 |
Oil Filter Options
Coolant & Transmission Fluids
| Component | Product Name | Code |
|---|---|---|
| Coolant | AMSOIL Passenger Car & Light Truck Antifreeze | ANTPC1G-EA |
| Coolant | AMSOIL Propylene Glycol Antifreeze | ANT1G-EA |
| ATF (THM400) | AMSOIL Signature Series Fuel-Efficient ATF | ATLPK-EA |
| ATF (THM400) | AMSOIL OE Fuel-Efficient ATF | OTLQT-EA |
| ATF (THM350C) | AMSOIL Signature Series Fuel-Efficient ATF | ATLPK-EA |
Engine Oil Specifications
| Specification | Details |
|---|---|
| Oil Grade | CF-4 |
Viscosity Guide by Temperature
| Temperature Range | Recommended Viscosity |
|---|---|
| Below 16°C | 5W-30 |
| Above -18°C | 10W-30 (Preferred) |
| Above -12°C | 15W-40 |
| Above -7°C | 20W-20 |
| Above 4°C | 30 |
How much oil does it take with a filter change?
Diesel maintenance notes for this vehicle
- Oil Filter: The AMSOIL Oil Filter (EAO24-EA) provides 99 percent filtering efficiency at 20 microns in accordance with ISO SO 4548-12.
- Coolant Capacity: The cooling system capacity is 24.8 quarts.
- Transmission Note: For the THM400 and THM350C transmissions, note that manufacturer technical service bulletins have updated specifications from Dexron II or III to Dexron VI.
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 during starts or heavy use. | Heavy-Duty Diesel Oil | Excels in extreme temperatures and maintains proper viscosity. | Must match temperature requirements. |
| Contaminants | Small particles can cause abrasive wear. | AMSOIL Oil Filter | Provides 99% efficiency at 20 microns. | Filter must be replaced per interval. |
Common maintenance concerns for this vehicle
Based on owner reports and historical data, owners of the 1986 GMC Jimmy should monitor several key areas:
- Engine Cooling: Historical complaints have noted engine-related issues; maintaining cooling efficiency is vital.
- Braking Systems: Some consumer reports have mentioned concerns regarding hydraulic service brakes and response times.
- Visibility: Ensure all lighting components, including headlights and turn signals, are functioning correctly to maintain safety standards.
Recall, TSB, and manufacturer communication notes
NHTSA research indicates one recall record for the 1986 GMC Jimmy regarding exterior lighting (Campaign 06E026000). This involved certain replacement lamps that failed to conform to federal safety standards. Owners should verify current open recalls by VIN through an official dealer or the NHTSA website.
About this vehicle
The 1986 GMC Jimmy represents a specific era in General Motors’ SUV history, sitting at the intersection of full-size utility and diesel capability. During this period, GM transitioned nomenclature to avoid confusion with the Chevrolet K5 Blazer; specifically, after 1986, these full-size models were often referred to as the ‘V-Jimmy.’ This vehicle is a derivative of the C/K truck line, sharing mechanical DNA with the heavy-duty pickups and Suburban wagons of the same era.
The engine specified—a 6.2L V8 diesel—is a critical component for maintenance planning. Owners should treat this 6.2L diesel as a workhorse engine, typically utilized for towing and long-distance durability rather than high-performance speed. Because this vehicle belongs to an older generation of GM diesel technology, maintenance focus should remain on fuel system integrity, cooling efficiency, and heavy-duty suspension components common to the C/K platform.
Note: As technical performance data like exact horsepower or torque for this specific engine code may vary, broader mechanical details should be verified through a dedicated service manual before performing major repairs.
Common questions about this vehicle’s diesel oil and maintenance
What is the preferred oil viscosity for my 6.2L Diesel Jimmy?
For temperatures above -18°C, SAE 10W-30 is preferred. Other options include 5W-30 for below 16°C or 15W-40 for above -12°C.
How often should I change my diesel oil?
While specific intervals depend on usage, AMSOIL Signature Series products are designed to allow you to confidently extend drain intervals.
Does the 6.2L Diesel require a specific oil grade?
The AMSOIL lookup note specifies an oil grade of CF-4 for this application.
What should I do if my engine is running hot?
Ensure your cooling system is maintained with appropriate fluids like AMSOIL Antifreeze and check the 24.8-quart capacity is correct.
Can I use synthetic oil in my 1986 Jimmy?
Yes, AMSOIL offers 100% Synthetic Max-Duty Diesel Oils such as DTTQT-EA which are designed for high protection.
How do I verify if my vehicle has an active recall?
Always contact a local dealer or use the NHTSA website to check your specific VIN for any outstanding manufacturer communications or recalls.
Disclaimer: This information is derived from provided source data. Always consult your owner’s manual and verify all specifications before performing vehicle maintenance.