The Owner's Manual for my 2023 Subaru WRX tS 2.4 litre specifies Oil Grade as: API classification SP with the words "RESOURCE CONSERVING" or ISLAC GF-6A. And SAE viscosity No. as: 0W-20 (equivalent to factory filled oil) or 0W-30, 5W-20, and 5W-30.

Your Penrite Enviro+ Fully Synthetic 0W-20 seems to be a perfect fit, but the Subaru 2023 WRX isn't in the suitability list. Please explain? 

Thanks Steve

Photo sent.

Kind Regards

Gary