Chevron Products Co. introduced Delo Grease ESI, an extended service interval grease. The grease is designed as a 30,000-35,000-mile drain interval grease, the company says. In viscosity, it is between NGLI No. 1 and No. 2 greases, designed for general chassis purposes from the fifth wheel to wheel bearings. Chevron recommends following factory drain intervals for engine oil.