Me and my bro changed out a motor on Kia and the motor we put into it smoke like a mofo. So we checked everything again, cause we thought it was radiator fuild in the engine, but found nothing. So we drove it a couple miles hoping it went away, but nope. Well we we decided to take it for a trip around half of Houston. Well smoke went away after about 50 miles of driving. I guess the problem was that motor had sat for a while, maybe a few months. Motor came out of a wrecked vehicle. So I'm sure it was that. But check your motor for a cloudy look. Maybe waterradiator fluid in your engine.