You cannot pay with literal "stacks of cash." Due to anti-money laundering laws, payments must be made via bank transfer or cashier's check.
A recent utility bill (CFE for electricity or a water bill) in your name is standard. The Financing Hurdle buying a new car in mexico
While you can’t negotiate the base price, you can often ask for free extras like window tinting or floor mats. Requirements for Foreigners You cannot pay with literal "stacks of cash
You won't typically find the surprise "dealer add-ons" common elsewhere. buying a new car in mexico
Listed prices already include sales tax (IVA).