I just spoke with a technical support rep from Harbor Freight. He said that if is calls for SAE 30W that SAE 30 should be fine.
SAE 30W
Sae 30w
SAE 30W
Sae 30w
SAE 30W in the summer and SAE 10w30 in the winter. I recommend you use 100% synthetic oil in any air cooled engine.
SAE 10w30 or SAE 30w. I highly recommend you use Synthetic oil in this air cooled engine. Change the oil once a year.
In order of preference according to the manual. "Ford Super Premium" weights 15w-40, SAE 10w and SAE 30w.
Better to use straight 30W.
If the recommended oil is SAE30 why would you use SAE 10W30? Some mowers recommend either of these weights but if your recommends 30W then using 10W30 will cause it to use oil.
I recommend you use synthetic oil in any air cooled engine. If you only use it in warm weather then use SAE 30W oil. If you use it in cold weather use SAE 10w30 oil. It holds 20 ounces.
Sae 30w if it is over 50 Fahrenheit. 10w-30 if it is under.