yeah, you can use any other oil that is 30 weight. you should not use synthetic though. just go with normal old 10-30W or strait 30W do not mix the two though.
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The only reason i said to stay away from it is that some engines are not recommended for synthetic.
Of course if the manufacture say's do not use synthetic then do not use it. I personally know of no small engine manufacture that prohibits the use of synthetic in any of their engines produced today.
Here is what Briggs & Stratton say's on their website. "Briggs & Stratton offers a Synthetic 5W-30 oil that provides the best protection at all temperatures as well as improved starting with less oil consumption."
As long as the synthetic meets the requirements put forth by the manufacture you can use it in your small engine.
HOW DO YOU RESET OIL LIGHT ON CUD CADET
Cub Cadet riding lawn mower's use 30-weight oil. Keeping the oil changed in your Cub Cadet will prolong the life of the mower, and help it run smoothly and efficiently.
10W-30 motor oil is recommended for use in a Cub Cadet hydrostatic zero turn lawnmower. Any brand of oil is acceptable.
PH2844
2 qt
On the Cub Cadet use Fram PH2844 On the Briggs & Stratton use Fram PH8170
L14476 Purolator
One and a half quarts
PH4967 :)
It will go off after the next hour of use
2 quarts of SAE 10 W 30
CH6 : change oil and oil filter. this code appears every 50h, and last for 1h