I have a 2015 ST, changed the factory fill out at 1500 miles-and It doesn't matter when you change it. I have Redline in it now and mix 3 qts of 5W30 and 3 qts of 5W40 with an Amsoil EA034 filter so a full 6 quarts fits in instead of the 5.7 with the factory filter. Also, ignore the factory oil gauge - it will scare the [censored] out of you. When the oil is hot and its idling, it will read bout 7 lbs of pressure, and won't go over 35lbs cruising at 75mph. The only time it will go past 50lbs is when you hit over 5000rpms and at startup.