Run from that 40k miles car. Smoke from the engine, unless you went through a pool of water which cause some steam. I can't think of any excuse as to why you see it. But congrats on finding a car similar to the one you want to end up with !
BMW and Mercedes Build Beta Products!
Lexus build Release Candidate Products!
Why does this matter?
CAUSE EVERY TIME someone says Lexus has better build quality, one should consider what Toyota their Lexus Engine and chassis platform comes out of and how long that part has been tested in the real world!