So you think we know more than the engineers at Honda ?
Honda are probably the most brand name conscious business on the planet
They exited the ride on market rather than downgrade their products to the price that retailers demanded
And it is a lawnmower not a top fuel drag car.
The engine is running at a very lazy 3200 rpm so the stress on the cam followers is 5/8 of SFA
I stopped deciding I knew better than engine designers by the time I was around 20.
Down here in OZ I use 10W 40 mower oil in all Honda products as we average 30+ C for 1/2 the year
Depending which wholesaler I get it from it will either be Honda 10w 40 or Kawasaki 10w 40 .
Next to printing ink , oil is probably the most complicates liquid the average man comes in contact with .
Oil engineering requires a decade of tertiary education yet every fool looks at a couple of you tube videos and suddenly they consider themselves some sort of expert.