Chevron Products Company has announced that its diesel engine oils, including Delo®, Ursa® and RPM®, have passed all American Petroleum Institute (API) and U.S. original equipment manufacturer (OEM) tests required to meet the new API CJ-4 diesel engine oil specification. The company's new API CJ-4 oils offer improved performance for existing and 2007 engines operating on ultra low sulfur diesel (ULSD).