If you converted to the Permanente Visa since the law changed in November of 2012, then your Permanente card should qualify you for vehicle import purposes, Temporal Visa or a FMM requires the 180 day TVIP. No more letters from Aduana giving you annual permission to keep the vehicle in Mexico without a new sticker every 180 days. If you went Permanent then you need a letter to exit the country with your foreign plates and you have 30 days to do so. No foreign plates permitted with the Permanent visa. On a side note (in Jalisco anyway), you will get hung with 35% capital gains taxes if you sell property in Mexico with any Visa other than the permanent visa. The tax is 35% of the difference between the sales price of the property and the value on the tax rolls, not the difference between what you pd for the property and the sales price when you sold. Tax roll values here are a mere fraction of the value of the property usually so the capital gains tax can be a big hit.