With the Hondas I’ve found more issues with sensitivity to dusty fueling conditions. Every one I’ve had eventually develops a surging throttle condition, including my fairly new eu2000i. And in every case, cleaning the jet and installing a fuel filter makes the problem go away.
in the eu2000, there’s not much room for a filter, and the gas line is like 1/8”. I used a metal r/c filter designed for gas in it, and sealed its threads with seal-all as an extra precaution. Of course, when I did this, I also had to clean the jet because refueling on a dusty day is all it took.
with a heavily used mower, M1 5-30 was too thin when mulching in the southern heat here, and the engine was damaged over time. 10-30 solved the problem and the sparklies stopped showing up in the oil. It kept increasing start up smoke and consumption until I changed to 10-30 and it remained the same, but didn’t get worse, after that. Based on that, I won’t get thinner than a 10-30 in ope.
oh, and I’ve run that eu2000i nonstop for days following storms. Using synthetic oil, a week is fine as long as you check it.