Designed to provide modern diesel engines with hardworking protection that adapts to virtually any driving condition, Shell Rotella T5 Ultra 10W-30 Synthetic Blend diesel engine oil with Triple Protection Plus technology uses synthetic base oils plus advanced additive technology to provide protection against wear, deposits, and oil breakdown. Shell Rotella T5 Ultra 10W-30 Synthetic blend's lower viscosity helps save on fuel without sacrificing wear protection. It delivers better fuel economy than SAE 15W-40 oils and API CK-4 oils. It is formulated to minimize oil consumption and deliver increased resistance to breakdown under high temperatures. Shell Rotella T5 Ultra 10W-30 Synthetic Blend oil is suitable for use in 2017 as well as some late model engines allowing an API FA-4 diesel oil in this viscosity. Some engine manufacturers do not yet approve the use of API FA-4 engine oils, while some allow limited backwards compatibility to earlier model year engines. Check with your original equipment manufacturer regarding the use of API FA-4 oil. It meets the requirements of all of the major U.S. and European engine manufacturers for low emission applications requiring an API FA-4 quality diesel oil. Exceeds the requirements of the following OEM specifications: Cummins CES 20087; Detroit Diesel Fluid Specification (DFS) 93K223; MB-Approval 228.61. For technical questions, contact the Shell Technical Help Desk.