Okay, now I'm intrigued - why the 5w-30/0w-20 mixture (other than for the receipt)?
First, I admire your curiosity. It suggests a closely examined life.
As previously mentioned, I'm not a fan of 0W weight motor oils. In this regard, as you may know, about a decade ago there was a rash of complaints about camshalft galling in k-series motors. It was impossible to determine if there was a single cause -- neglect, abuse, high mileage -- or perhaps a combination of all three and 0W-20 weight oil. I pursued it. The only constant seemed to be 0W weight oil and high rpm.
Out of an abundance of caution, I began contacting Honda representative in other countries via the 'net to determine where else 0W weight oils were the recommended fill. Or, stated differently, where 0W oils were not. I learned there are only three countries where Honda recommends 0W-20 weight motor oil. Here, Canada and Japan. And, even in those countries, to this day Honda still recommends 5W-30 (or 10W-30) for its higher performance and turbocharged engines. This cannot be happenstance.
So, in a nutshell, because I live in a moderate climate, I could care less about extremely cold-weather starting (when, in fact, most engine wear occurs). I'm after the (approximately) 22% higher viscosity that 5W-30 provides at 100 degrees C. I also know that M1's 0W-20 weight oil is one of the "thickest" 0W-20 weight oils on the market, both at zero degrees Celcius and 100 degrees. My concoction is, therefore, a happy compromise (for me -- I'm not a zealot trying to push it on others). And, as I mentioned before I want to have a handful of 0W receipts lying around should lightening strike.