Synthetic oil is regular oil that has been "cracked" by chemical processing. You can go back and forth, just remember to use the grade of oil specified in your operator's manual and if you choose a 'store brand,' check that it has the lab certification that it meets the standards.
Cheap off-brand oils may be just as good as store brand or known brands but haven't had their quality independently verified, so it might not be.
That's all I think I know about that.
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