IF YOU LOOK AT THE AMSOIL COMPARISON TESTING REPORTS THEY ARE PERFORMED BY INDEPENDENT LABRATORIES NOT AMSOIL. THE TESTS ARE ASTM LABRATORY REPEATIBLE TESTS. IF THEY WERE FALSE ALL THE BIG OIL COMPANIES WOULD SUE . I USE AMSOIL AND KNOW HOW GOOD IT IS. YOU CAN RUN IT FOR 10-15000 MILE WITH NO PROBLE...