Again this oil is not for the space program guys. Take used oil from your car. Dump it in your mower. Will be just fine. Farmers have been doing this for decades.Bob Is The Oil Guy has a lot of truly smart oil professionals posting. Not old wives tales mechanics.
There are ways to measure oil performance and the Kirkland @Scott_HRR poo-poos rates very highly. Mobil 1 mid pack.
