Chevron Products Co.’s new heavy duty Ursa Super Plus EC SAE 10W-30 motor oil is designed to help improve fuel economy in heavy duty diesel vehicles now using SAE 15W-40 engine oil, according to Chevron. The motor oil also protects engine components against wear and corrosion, and is a complementary product to Chevron’s Delo 400 XLE SynBlend SAE 10W-30. Ursa Super Plus EC SAE 10W-30 is specifically formulated for 2010 compliant low-emission diesel engines with selective catalytic reduction, diesel particulate filters and exhaust gas recirculation.