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I recently purchased a 2016 Sierra XLT with E assist, with 8200 miles from Car Max. Within a day I noticed a whine from engine, They took it to the local chevy dealer who after some unusual diagnosis said it was the oil pump. They changed oil pump and when I picked it up it was fine. A few miles down a slow road I could smell coolant but all gauges were normal. I thought it must be the car in front of me. A few miles later the dash lit up with low oil warning. (gauges still ok) There was no oil in the pan. None since they just had it off. Replaced oil and have talked to dealer who believes at this time likely no damage. I do not hear anything strange. I am returning for a full check up. What do you think?