Designed to provide hard-working protection that adapts to your driving conditions, Shell Rotella T5 FE 10W-30 Synthetic Blend diesel engine oil provides excellent protection against wear, deposits, and oil breakdown. Its lower viscosity delivers better fuel economy compared to an API CK-4 SAE 15W-40 heavy duty engine oil, helping deliver savings without compromising engine protection or durability. It also provides increased resistance to breakdown under high temperatures and offers a low-ash formulation that helps protect exhaust catalysts and particulate filters found on the latest low-emission vehicles. Shell Rotella T5 FE meets the requirements of the major US and European engine manufacturers for low-emission applications requiring an API FA-4 diesel oil (check with your original equipment manufacturer regarding the use of API FA-4 oil.) Shell Rotella T5 FE is backed by a free warranty valid up to 10 years or 300,000 miles, whichever comes first*. (*Shell Rotella Limited Warranty: Valid up to 10 years or 300,000 miles, whichever comes first, if you exclusively use Shell Rotella T5 Synthetic Blend heavy-duty engine oil. Terms and conditions apply. See Rotella.Shell.com/warranty for details.)