A guy hit my brand new 2016 vehicle (had less than 5,000 miles on it) and was determined to be 100% at fault. I am repairing the vehicle at the Nissan dealership where I bought it. His insurance is saying that aftermarket parts must be used on my car instead of OEM parts per their policy. According to the guy's insurance company-Liberty Mutual-the required repair to "pre-loss condition" is satisfied by using aftermarket parts and that is all that they have to do. Is this correct? Using aftermarket parts will void some of the bumper to bumper warranty that I have with the manufacturer of the vehicle (Nissan). What is the insurance company required to do in New York? The pre-loss condition included the manufacturer's warranty, so it seems to me that Liberty should have to pay for OEM parts so that I can maintain the manufacturer's warranty.