If you buy ahead, when you can get a deal, maybe a MIR, you can use pretty much what you want.
In the past several months, there have been MIR offers on Edge (current), M1, M1 EP (current), M1 AFE (current), PP and Valvoline (current).
So, unless you are a dedicated user of a botique oil, you can get a deal and stick with a brand.