For the 2018 Ram 3500 Pickup with the 6.7L 6-Cylinder Diesel (Engine Code L), the engine oil capacity is 12 quarts (including filter replacement). The recommended viscosity is 15W-40 for ambient temperatures above -18°C, and 5W-40 synthetic oil is required for temperatures below -18°C to prevent severe engine damage. AMSOIL recommends using high-quality synthetic diesel oils like Signature Series 5W-40 Max-Duty Diesel Oil.
What oil does a 2018 Ram 3500 6.7L Diesel take?
The 2018 Ram 3500 with the 6.7L diesel engine requires an API CJ/CK-4 oil that meets specification standards MS-10902. Additionally, oil meeting Cummins CES 20081 standards may also be used. A low ash diesel engine oil is required for this application.
AMSOIL product recommendations
Based on the AMSOIL lookup for your 2018 Ram 3500, here are the recommended fluids and filtration components to maintain peak performance.
Engine Oil Options
| Product Name | Viscosity | Code |
|---|---|---|
| AMSOIL Signature Series 5W-40 100% Synthetic Max-Duty Diesel Oil | 5W-40 | DEOQT-EA |
| AMSOIL 5W-40 Heavy-Duty 100% Synthetic Diesel Oil | 5W-40 | ADOQT-EA |
Oil Filter Options
| Product Name | Code |
|---|---|
| AMSOIL Oil Filter | EAO80-EA |
| WIX XP Oil Filter | 57620XP-EA |
| WIX Oil Filter | 57620-EA |
Additional Maintenance Products
| Component | Product Name | Code |
|---|---|---|
| Air Filter | WIX Air Filter [1] | 46930-EA |
| Coolant | AMSOIL Passenger Car & Light Truck Antifreeze & Coolant | ANTPC1G-EA |
| Coolant | AMSOIL Propylene Glycol Antifreeze and Engine Coolant | ANT1G-EA |
Engine Oil Specifications
| Specification | Details |
|---|---|
| Oil Grade | SEO39 (AMSOIL lookup oil grade) |
| Viscosity (Warm) | 15W-40 (Above -18°C) |
| Viscosity (Cold) | 5W-40 (Below -18°C) |
| Required Standard | API CJ/CK-4 (MS-10902) or Cummins CES 20081 |
Warning: Failure to use SAE 5W-40 synthetic engine oil in ambient temperatures below 0 F (-18 C) could result in severe engine damage.
How much oil does it take with a filter change?
The total capacity for the 6.7L diesel engine is 12 quarts when replacing the filter. When performing an oil change, follow these steps:
- Fill the engine with 12 quarts of oil.
- Start the engine and let it idle for several minutes.
- Check for leaks.
- Stop the engine and wait 30 minutes to allow the oil to drain back into the pan.
- Re-check the level to ensure accuracy.
Oil Drain Plug Torque: 37 ft/lbs.
Common diesel oil-related concerns and how AMSOIL products may help
Diesel engines operating under heavy loads face unique lubrication challenges. The following table outlines common concerns for this vehicle type.
| Concern | Why it matters | AMSOIL Product | How it may help | Limitation |
|---|---|---|---|---|
| Extreme Temperatures | Cold starts or high heat can affect viscosity. | DEOQT-EA | Excels in extreme temperatures. | Not a substitute for proper viscosity selection. |
| Engine Wear | Soot and contaminants can cause abrasion. | EAO80-EA | Provides 99% efficiency at 20 microns. | Requires regular replacement intervals. |
| High Load/Towing | Increased pressure and heat on components. | DEOQT-EA | Delivers 6X more wear protection. | Must follow manufacturer drain intervals. |
Diesel maintenance notes for this vehicle
Maintenance of the 6.7L Cummins diesel engine should prioritize heavy-duty service intervals. Key areas of focus include:
- Filtration: Ensuring all filtration components meet manufacturer specifications is vital for longevity.
- Fuel & Air: Monitoring fuel filter replacement and air handling systems is critical for modern diesel operation.
- Turbocharger Health: Proper lubrication is essential to protect the turbocharger from wear.
- DEF Management: Owners should stay current with Diesel Exhaust Fluid (DEF) management as part of standard maintenance.
Recall, TSB, and manufacturer communication notes
NHTSA research indicates several recalls and common complaints for the 2018 Ram 3500:
Official Recalls
- Steering Linkages: A recall (Campaign 18E096000) was issued regarding aftermarket suspension kits that could weaken the joint between the steering drag link and knuckle, potentially causing loss of steering.
- Tailgate Latch: A recall (Campaign 19V347000) involves the tailgate actuator limiter tab which may fracture, causing the tailgate to unlatch while driving.
- Backup Camera: A recall (Campaign 18V398000) was noted for potential loss of image display on the backup camera.
Note: Always verify open recalls by using your specific VIN through official manufacturer channels or the NHTSA website.
NHTSA Complaint Patterns
Based on owner reports, the most common complaint components for this model year include Service Brakes (Hydraulic) and various electrical systems. Please note that these are owner-reported concerns and are not verified defects.
About this vehicle
The 2018 Ram 3500 is a heavy-duty pickup truck from the Ram Trucks division of Stellantis. It is positioned as a critical tool for high-capacity towing and hauling, often utilized in commercial applications through its chassis cab configurations.
A defining characteristic of this vehicle’s powertrain is its association with Cummins diesel engines. The 6.7L diesel engine is designed for high torque requirements and long-term durability in demanding work environments. Because these vehicles are frequently used for heavy-duty tasks, maintenance research often focuses on specialized fuel systems, air handling, and emission control components.
Owners of the 6.7L Cummins platform typically prioritize rigorous service schedules to manage the complexities of modern diesel technology, including turbocharger protection and soot management. While this vehicle is built for durability, ensuring all fluids and filters meet the specific requirements of the Cummins engine is vital for long-term reliability.
Common questions about this vehicle’s diesel oil and maintenance
What is the oil capacity for my 2018 Ram 3500 6.7L?
The capacity is 12 quarts when including a new oil filter.
Can I use 15W-40 in cold weather?
If ambient temperatures are below 0 F (-18 C), you should use SAE 5W-40 synthetic engine oil to avoid severe engine damage.
What oil specification does the Cummins engine require?
The AMSOIL lookup note references API CJ/CK-4 (MS-10902) and Cummins CES 20081 standards for this application.
How often should I change my diesel oil?
While specific intervals vary by use, AMSOIL products like DEOQT-EA are designed to help confidently extend drain intervals.
What filter should I use for the 6.7L diesel?
Options include the AMSOIL Oil Filter (EAO80-EA) or WIX XP filters like 57620XP-EA.
How do I check my oil level correctly?
After filling, idle the engine for several minutes, stop it, and wait 30 minutes to allow the oil to drain back into the pan before checking the level again.
Disclaimer: Information provided is based on available source data. Always consult your owner’s manual or a certified professional before performing maintenance.