1998, but in practice from the early 90's because leaded gasoline is incompatible with catalytic converters. Leaded gas was banned in 1996 in the US, but in pra

1998, but in practice from the early 90's because leaded gasoline is incompatible with catalytic converters. Leaded gas was banned in 1996 in the US, but in practice disappeared by the early 80's (catalytic converters were mandatory on new US cars from 1975). Most cars sold in Mexico are used American cars, which is the reason for the lag.