Kendall Super D-XA Diesel Engine Oil is a synthetic blend CK-4 oil developed for use in diesel engines. This product is made to meet 2007 and later EPA on highway exhaust emissions standards. It is also backward serviceable for use in pre-2007 diesel engines, and may be used in mixed fleets with both diesel and gasoline fueled vehicles. This product has an added liquid titanium protection additive for enhanced oxidation resistance and protection against wear. It also provides increased engine protection in new and older diesel engines. It has also provides excellent bearing corrosion protection and protects against sludge and varnish formation.