Honda also sold a 0w-20 syntheticBLEND oil
They don't require full synthetic. They require a current "API" 0w20 oil. So, doesn't need to be full synthetic.
I don't know what the cost savings are to a 'blend' when compared to a 'full' synthetic. Maybe someone at Hondacura can answer that.
I haven't seen the quarts sitting at the Honda parts counter in a while. But, they had the blend right next to the full synthetic with a minor price difference.
If it were my vehicle, I'd request a full synthetic, and then pay more since its not a requirement. Knowing what we know of certain Hondacura engines with fueling issues, I'd considered an analysis to see how the oil is doing with your driving style. I would adapt the grade and thumb my nose at the owners manual and Acura.
Looks like BP/SOPUS also have a 'blended' 0w20, which means bulk/totes can also be licensed toward API SP/GF6 and not be full synthetic for that 0w20 grade.
HONDA GENUINE SYNTHETIC BLEND 0W-20 is formulated to provide excellent wear protection, to minimize the formation of sludge and varnish, and to resist viscosity and thermal breakdown even in severe service. Honda Genuine Synthetic Blend Motor Oils are pre
shop.sclubricants.com
And, page 593:
owners.acura.com