According to a survey conducted by National Oil and Lube News (NOLN), Pennzoil has been named #1 motor oil (synthetic, synthetic blend and conventional) in the Passenger Car Motor Oil category. The annual survey, which compiled results from 1,700 facilities across all 50 states, concluded that Pennzoil has risen amongst its competitors with top results in best-selling synthetic, synthetic-blend, conventional and high-mileage motor oil. In addition, fellow Shell engine oil, Shell Rotella, has been named #1 best-selling in the diesel engine oil category for its 15W-40 and 5W-40 viscosities by over 40% in comparison to competitors.