15 W 40 Diesel Engine Premium Full Synthetic Oil (10TBN)

For diesel engines only. 15W-40 diesel oil enhances mileage, extends oil change and drain times.



SKU: OG 2540-1 Category:


15W-40 Diesel Engine Premium Full Synthetic Oil (10TBN) improves lubrication, fuel economy and extends drain Intervals in ultra-low emission diesel Engines. This is the best choice diesel engine oil for years 2007 and newer, heavy-duty and pickup truck diesel engines requiring API CJ-4 emission-quality oil standards. This diesel oil delivers extraordinary lubrication in all diesel engines in commercial, fleet and personal vehicle applications. OnGuard 15W-40 Diesel Engine Premium Full Synthetic Oil represents the current state of the art in lubricant technology. By blending performance additives with ultra-high quality synthetic base stocks, OnGuard 15W-40 Motor Oil’s superior formulation provides acid control, deposit control, and protects against engine wear, providing enhanced engine performance, and extended drain intervals. It meets the specification for diesel and gasoline engines requiring API classification CJ-4, CI-4 Plus, CI-4/SN oil. It is also suitable for use in CAT ECF-1-a, ECF-3, Mack EO-O Premium Plus, and Cummins CES 20081 applications.

Additional information

Weight 2 lbs
Dimensions 4.5 × 2.5 × 8.5 in
About Our Formulas

Our lubricants are formulated and designed to include synthetic components that help provide more consistent viscosities, benefiting today’s high-tech engines and “classic” engines as well. OnGuard formulas always include state-of-the-art synthetic lubricating agents that are far better for engines than conventional oils to reduce bearing loads, oil drag, oil contamination and unnecessary power losses. OnGuard formulations protect internal engine metals while improving power and mileage. OnGuard Engine Oils are an excellent choice for on-the-highway vehicles, providing both oil and fuel mileage enhancement. This also applies to off-road vehicles and severe racing applications. OnGuard Engine Oil products are compatible with all conventional oils and synthetic engine oils.


OnGuard Engine Oil, Inc. does not warranty any of its products to be fit for any specific purposes, uses or applications. Each vehicle engine manufacturers’ published lubrication recommendations and/or the vehicle’s maintenance mechanic should be consulted and followed when selecting engine oil.