I bought a Mercedes ML 350 4 Matic on July 14,2017 from CarMax at W Sahara Ave. Las Vegas. The salesperson was very helpful except he did not let me test drive on highway. He told me that they give us 5 days guarantee. When I drove home I felt that the car was shanking and bumpy on the highway when it's above 60miles /hr. The salesperson told me that it might be a problem of alignment and send me to a contracted garage to fix the problem. I went and did the balance and alignment. Carmax paid for it. A week later the problem started again. The car alignment is completely off and pull to right when driving. I called and the salesperson told me it might need a part to fix it. He told me to call the service department on Monday. Regardless what the problem was. CarMax should fix up the problem before they sale it. Or at least let buyers to test drive cars on highway. It is 105-110 degrees outside. I have to drive the car to be fixed many times. It is July 29. The problem is still not solved.