Not that I make this a practice anymore as I once did about 45+ yrs ago when money was tight. However, I'll do it now and again with more compatible oils that I have laying around from our own vehicles. And not that I believe that this is an optimal way of doing an OCI but, I also don't think it hurts anything and I have my own proof of this. Lots of it!
In my distant past, I've used 5-6 different grades of oil, each being a different brand as well and my engines(placebo) seemed to run better/smoother/stronger than with the required/recommended oils.