leasing is not financing the car or loan, in leasing car is rented to you for a set amount monthly for set time. at the end of the term you return the car to owner(bank) or you can buy the car at deprciated price from bank.
if you take as loan and buy the car surely its interest and against islamic sharia law. there are few sharia compliant banks in pak and abroad so you can go with them. set up will be almost same but on islamic rules, you end up paying same amount of money on this method too. they will rent the car to you, charge you rent plus some amount towards car value to partly buy, end of the term is car is paid or you pay remaining deprciated amount and you walk out with car or without depending on your plan.
but i really dont like people lecturing people about oh this is haram, (we all know we are muslims, but somehow some living or brought up abroad think they know more or best than the others just cause they stumble upon by chance to light of islam at some point in life and that makes them more knowledgeable and better than others)
checklist, how many houses and businesses you have that work cause of banks? mortgage, commercial mortgage, card payments etc?????