Buying a car from someone who bought it with a riba-based loan
Question

                What is the ruling on buying a car in instalments from a company when it is known that this company borrowed money from the bank with interest to finance this transaction?.
Praise be to Allah.
    We ask Allaah to reward you with good for your keenness to 
    seek out halaal transactions and your caution against dealing in haraam, 
    especially your question about the issue you mentioned. Undoubtedly 
    borrowing with interest is the essence of riba (usury) that Allaah and His 
    Messenger have forbidden. One of the principles of fiqh on which there is 
    consensus among the scholars is: “Every loan that brings a benefit is riba.” 
    The lender in this case has committed a major sin, namely dealing in riba, 
    but the fact that he has committed this sin does not mean that it is haraam 
    to deal with him in buying and selling. The Prophet  (peace and 
    blessings of Allaah be upon him) used to deal with the Jews, and they are a 
    people whom Allaah has described in His Book as dealing in riba and 
    consuming wealth unlawfully. 

    Based on this, it is permissible to deal with a person who 
    deals in riba, buying and selling. 

    There is nothing wrong with you buying a car from this 
    company, and there is no sin on you for that, in sha Allaah. 

    And Allaah knows best.