I remember when Hondas first came out with 5W-20 as the standard oil choice, some Honda owners were debating whether or not to use 0W-20, which back then was pretty much just Mobil 1 or Honda's OEM oil that was probably just relabelled Mobil 1. It was only specified back then for the Insight and the Civic Hybrid in order to boost the fuel economy.
Honda did have issues with 5W-20 oils slugging in their early VCM V6s. From what I've heard in discussions, few of those issues were seen when something like a 0W-20 oil was used or maybe Mobil 1 (or similar) 5W-20s.