The 2003 Aztec and 1996 Neon are doing fine with this stuff. Aztec has 1,000 miles on it and the Neon has about 800 miles on it. Oil is still clean, not black as others have had happen. Aztec gets a little better mileage with it and the Neon is still getting 5 days out of a quarter tank. Before the Neon was getting 4 days out of a quarter tank. No top off oil with either vehicle so far but, neither vehicle used any oil on other brands in the past with 3,000 mile oil changes. Time will tell with this oil.