Take to the mechanics or dealer  before u buy that car coz don believe on owner . Simply they have to sell their car so they will tell u its gud but If u take to the mechanics before u buy and spend around $100 They will inspect everyhting and tell u whether there is any serious problem in engine or not.If windshield is only the case that won't be big problem .But Never trust on onwer words so take to good mechanics or to the dealer and they will tell u history and present condition about that car.