Put the M1EP 0w20 in the wifey's Rav4 as they were out of 0w20 AFE at Walmart, which is what I'd been using recently. Plan to go 10K with a mid-run sampling. The 2010 Rav4 is technically limited to 5K OCI, but the later models with the same engine spec'd for 0w20 only, allowed 10K. So we're going to try it.
As for why I switched from 5w20 to 0w20, well, there seems to be less engine noise when cold during the wintertime on 0w20 and the car just seems to run smoother with it in general, from a pure seat-of-the-pants impression.