Buy or Lease BMW X5 60i

With current interest rates I am considering leasing the car and and then buy it out after 3 years. This way I can save 30k of down payment and invest that money somewhere else. I do understand that residual value after 3 years from dealer may be more than the market value of the car but that difference is recuperated if I invest that amount rightly(HY or rental). FYI: Lease with 5k down vs EMI on finance with 40k down is almost same. Why do you all think? TC:220k #auto