What is the ruling on buying a car from a dealership that offers 0% interest loans, knowing that it deals with a usurious bank and pays the interest on behalf of the buyer?

It is not permissible to take interest-bearing loans, even if the dealership pays their interest, because they are forbidden. However, if the loans are optional promotional offers, it is permissible to buy the car from the dealership without taking the loan, based on the permissibility of dealing with someone whose wealth is mixed in buying and selling, except when dealing directly with the unlawful money itself. It is preferable to deal with those who do not engage in usury.