Re: Synthetic oils: Synpower??
Valvoline Synpower meets the Chrysler spec as per the attached pdf pulled directly from their website. There's no such thing as "certified" for the Chrysler spec, Chrysler publishes a criteria, they don't test oil. If the oil meets those criteria then the oil manufacturer certifies it, not Chrysler. Now, companies like Porsche, BMW, VW (see a trend here) "certify" the oil as OEM equivalent but Chrysler, Ford and GM do not though GM is pushing another certification, Dexos but that's an entirely different animal.
No issues, it will be fine.
Extracted from the pdf:
Chrysler MS-6395 0W-20 5W-20 5W-30 10W-30
2012 Grand Cherokee SRT8 Black/Black