I worked in the Service Department for a Chevy dealership...They are full of shiit by telling you they cant give you a loaner until the parts come in....So, much B.S. The dealership provides the loaner cars, but General Motors pays for the time out during warranty work.. I can guaruntee you that G.M was billed for the loaner you didnt recieve.
As far as the white smoke... If you drove 50 miles to work, and when you came out it was smoking and running rough on start up. They did not do the job right.. They may not have changed the Torque to yield bolts or done something else wrong..
I hope you demanded a car at that last repair?
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