SAE 10w30 full synthetic.
Automotive oil is identical to lawn mower oil. They are both internal combustion engines. I would however recommend you use 100% Synthetic oil in that air cooled lawnmower engine.
SAE 30 weight full synthetic oil.
SAE 30 weight full synthetic.
You can use straight 30 weight oil or 10w30. I recommend synthetic for an air cooled engine.
SAE 30 full synthetic oil, any major brand.
SAE 10W30 any major brand. I recommend you use synthetic oil in any air cooled engine.
I use two stroke oil
10w30 Synthetic oil is what is best for any air cooled engine. You can also use straight 30w.
I use 5w-30
It depends on the mower. Some use 30 weight. Some use 10w30.
Use 30w synthetic or 10w30 synthetic. 30w is preferred.