how long between syn oil changes?
1 (However, you should continue to check the oil level regularly and top off if needed. 2  That will help your engine get the full benefit of synthetic oil.). 3  Vehicles in which 0w-20 is an option to 5w-20 mineral oil, (or 5w-30), will continue to require 5,000-mile/6-month oil change intervals, even if 0w-20 oil is used.