I am going to run 0W-20 AFE for 20,000 miles with two microGreen filters. It's an experiment that may culminate in my first-ever UOA. I know that MG claims a 30,000 mile OCI, but my anxiety won't allow that - yet. MG sells filters in twos, which is odd when you consider that the company advocates THREE filter changes at 10,000 mile intervals before changing all the oil.
This doesn't scare me a bit, by the way.