I’ve used 10W30 in my residential lawn equipment for years without any issues. I just change it yearly. I know that people believe whatever they want to believe about oil brands and I have no idea where you are getting your information, but Super Tech (typically relabeled Warren oil) has worked perfectly fine for me for years. If you want to believe that manufacturers (be they automotive or small engine) use only the best, highest end products as OEM then that is up to you, but they definitely do not! They buy from the lowest bulk bidder, relabel it, and sell it for a premium through their dealers. Don’t get me started on VWs version of Toyota “world” automatic transmission fluid that started failing at 30,000 miles. My only (most recent) issue with Super Tech oil is that my closest Wal Mart store hardly ever has it in anything other than synthetic or synthetic blend varieties. They tend to only continue to stock the top selling products and, I guess, conventional motor oil is slowly become a thing of the past. You could probably even use synthetic 10W30 oil successfully if you wanted to, but I don’t see the need to pay up for it unless I absolutely have to. I am definitely in the camp of using the most cost effective oil that has the API "Service Symbol Donut" SJ, SL, SM, or SN markings on the label that I can find and change it regularly. If the engine is older, you might want to use Shell Rotella for the added zinc; otherwise, anything else is just overthinking it.