lemon law in illinois

What is the name of your state?
illinois
my father inlaw purchased a van 2 weeks ago from a dealer paid for it out right. the seals are bad and it is leaking alot of oil. the engine is shot. what can do about this. can we demand that the dealer pay for the labor to fix it or can we get our money back and purchase somehing else.
thank you

Was it new or used?

lemon law on a used car

its a used van

If the vehicle was sold "as is", which is most likely, your father has no claim.