Honda did not bother to spec the old 2.2 for twenty grades, although it would probably be fine with one.
When you consider that the latest of these cars is now fifteen years old, I'm not too surprised.
This engine would likely do just fine on a twnety grade oil, but why bother?
These engine runs well, deliver good fuel economy, have low oil consumption and live long lives on a thirty grade oil.
The one in my sig has done all of the above.
Why even consider using a twenty?