I purchased a 2018 GTS this past July. The car was built in March 2018, and still has the original factory oil. I am almost complete with the 2000 mile break in. I am inclined to replace the oil since it has been in the car for so long. The dealer says the free oil change is not until one year ( +/- 2 months) from the purchase date. That will be a little over 2 years since the oil was put in. I would rather be cautious and spend the $350 for an oil change now, and do the free oil change next September. I wanted to get some feedback from others as to your thoughts. Thank you.