SM 0W-20 grade engine oil instead of latest SN or SN plus

The owners manual references an ILSAC grade, as long as it meets that I don't see any harm...

moto g(7) power ?

 

As @jzchen kindly notes, the Owner’s Manual for cars sold in the U.S. calls for engine oil meeting ILSAC specifications, but Toyota’s Repair Manual (more info) series states that in Mexico and other countries, oil of these other grades and SAE viscosities can be used:

API grade SL "energy-conserving", SM "energy-conserving", SN "resource-conserving" or ILSAC multigrade engine oil

• 0W-20
• 5W-20
• 5W-30
• 10W-30

API grade SL, SM or SN multigrade engine oil

• 15W-40
• 20W-50

​

On that basis, I wouldn’t expect anything terrible to happen if you used Category SM oil, provided it’s replaced at reasonable intervals. I don’t know which (if any) benefits of ILSAC or Category SN oil—summarized in the American Petroleum Institute’s “Which Oil Is Right For You?” brochure (PDF)—apply in practice to Prius cars.

The definitions of Category SM, Category SN, and ILSAC GF-5 and its predecessors are in Annex G and Annex Q of API 1809, Engine Oil Licensing and Certification System (PDF).

 

I’m using just sn, not sn + 5w-20 oil. In fact it’s not even dexos gen ii oil