That will depend upon the Mexican state in which you reside and/or the US state in which you might drive your Mexican car. See previous posts in this thread. We have licenses from Texas and Jalisco and drive vehicles registered in SD and Jalisco. Never have had a problem with either car in either country.

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Read "Streets of Glass" to discover the experience of a retired couple's permanent move to Lake Chapala, Jalisco, Mexico.
PM for details.