Niteo Motor Medic M3616 Trans Medic Automatic Transmission Treatment & Shift Improver - 12 oz. MOTOR MEDIC is a local family owned company based out of Charlotte, NC. For more than 75 years, LIQUID WRENCH products, developed by the people who use them, has earned the trust of hard-working tradesment and the active DIYer through consistent, superior performance and a commitment to innovation.MOTOR MEDIC