I think this is normal on startup when the vehicle has been sitting for awhile, however, it makes a really weird noise when you put the car in reverse or drive. Let's say I put the car in reverse to back out of a parking spot, after I remove my foot from the brake and let the vehicle coast out of the spot (not putting foot on accelarator pedal) it will make a very odd noise for about 30 seconds. I've had it in the dealer a number of times for this however they have not been able to … …

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Number of issues… – Buick Forums