I sponsored a project to put this young retarded male to work cutting grass at various large homes near San Diego and a couple of horse ranches. I was really touched when this young adult, Tom, told me that he knew he was "stupid" and kind'a of "slow" but he could cut enough grass so that people would stop making fun of him and he could have good shoes that you purchased at a store where you could get ones that fit instead of used shoes that never fit. I purchased a Honda HRC216 if my memory is correct. A local farmer set up a maintenance schedule and we used Red Line 5w-30 engine oil because that's what the farmer uses in his air cooled engines for pumps, post hole diggers and stuff like that. Evidently that was an excellent choice because the engine outlasted the rest of the mower over 10 years of constant use. The farmer retired the mower and the engine is now on a well pump and is doing just fine. The young adult is now 10 years older and has learned to operate a lawn tractor that uses all Red Line products, and now does some or all of the service work. He also has a 2-stroke Echo weed eater and he will only use Red Line 2-stroke oil mixed with the gasoline based on his work with that farmer. Because of these two I use only Red Line oil in my Honda lawn mower and Echo weed eater. They are both also 10 years old and show no signs of wearing out at all.
The farmer's choice in oil was backed by periodic oil analysis and testing of several different oils just like he does with his tractors and other equipment, including tear-downs and inspections. Many farmers become excellent mechanics and engineers to keep their operations running and expenses under control. He told me you make choices based on facts, not anecdotal hearsay and you live on a budget.
If you only do a small lawn once a week or so it probably makes little difference what oil you use and saving a couple of dollars on a quart of oil every year may be more important than how long the mower will last. You might as well make your choice of oil based on what's on sale that meets the spec in your owner's manual and be done with it.
Tom now has 4 pairs of shoes including some very nice work boots, a Red Line cap and shirts, and no one around here makes fun of him, anymore. He has a waiting line of potential new customers. He told me he can't hire anyone because he's still working out how to read and write with his teacher. He also might not be as "slow" as people think because he asked me why government people do not like to see working people make their business get bigger and make more money so they can buy more stuff.