Understanding the 2018 Ram 2500 6.7 oil capacity is fundamental for any owner dedicated to maintaining their heavy-duty truck. The 6.7-liter Cummins diesel is a robust engine, but it requires the correct volume of lubrication to operate at peak efficiency and longevity. This specific capacity varies slightly depending on whether the vehicle is equipped with a standard cab, a club cab, or a crew cab, as well as the type of oil filter installed during the manufacturing process.
Factory Specifications for the 6.7L Cummins
For the 2018 model year, Ram provided specific guidelines for dealers and DIY enthusiasts regarding fluid maintenance. The general consensus from factory service information points to a total fill capacity of approximately 16 to 16.5 quarts when performing a standard oil change. This figure assumes the use of the original equipment filter and a clean oil pan. It is always best to check the dipstick after adding the initial amount to ensure the level sits precisely within the optimal range, rather than relying solely on a static number.
Variations Based on Configuration
Not all Ram 2500s are created equal, and this variance extends to the oil system. If your truck features the standard cab configuration, the oil pan is generally smaller, which might sit at the lower end of the capacity spectrum. Conversely, the crew cab models, designed for maximum practicality and equipped with a larger oil pan, typically require the full 16.5 quarts or slightly more to achieve the correct operating level. Always verify the specific requirement for your vehicle identification number (VIN) if you are uncertain about the fitment.
The Importance of Using the Correct Oil
Capacity is only one part of the equation; the specification of the oil is equally critical for the 6.7 Cummins. This engine thrives on high-quality diesel motor oil with a viscosity rating of 15W-40, which is standard for most on-road applications. Using the correct viscosity ensures proper lubrication in cold starts and maintains adequate protection under high-temperature conditions, such as towing or hauling heavy loads in summer weather.
Ensure the oil meets CJ-4 or CK-4 rating standards for optimal performance.
Synthetic blends are often recommended for their superior thermal stability.
Conventional oils may require more frequent changes due to faster breakdown.
The wrong oil weight can lead to decreased fuel economy and increased wear.
Always replace the drain plug gasket during an oil change to prevent leaks.
Consult your owner’s manual for the exact API service category required.
Step-by-Step Oil Change Procedure
When tackling an oil change on the 2018 Ram 2500 6.7, preparation is key to managing the oil capacity effectively. Because this is a diesel engine, it operates at high temperatures, so allowing the engine to run for a few minutes warms the oil, making it drain more completely and safely. Position the truck on a level surface, engage the parking brake, and lift the front end securely if necessary to access the drain plug.
Place a large-capacity drain pan that can hold at least 20 quarts, as the used oil volume will be close to the new fill amount. Remove the drain plug carefully, allowing the old oil to flow out fully before replacing the plug securely. Next, remove the old oil filter, being prepared for some spillage, and prepare the new filter by applying a small amount of fresh oil to the gasket. Screw the new filter on hand-tight only, then add the new oil gradually while monitoring the dipstick to avoid overfilling.
