The Border Crossing is, I believe, Customs and Immigration not the Canadian version of IRS. So yes, you can bring the car in stating yourself a resident of Mexico. You are not putting Canadian tags on it so you're not importing it. Your not a Canadian resident so you're not importing it. Since you are working in Canada are you paying taxes on that money in Mexico? Yes 15 percent to Canada at source but you can get that back after verifying payment in Mexico. Now if you are trying to skirt around paying taxes you just may end up in serious trouble. I would suggest you hire an attorney in Canada competent in this field. I sure wouldn't be asking anyone on this board these technical questions because laws change and Revenue Canada will certainly want to screw you if possible.