I've run mostly M1 AP 0w20 in mine, but did 1 run of PUP and one of M1 EP. All produced good UOA's. I like the PAO in the M1 oils, but I think this engine is easy on oil, so any of them will perform well. Btw, that is indeed the Pentastar Upgrade in the Grand Cherokee, which is the same as in the new 2018+ JL Wrangler. I believe the engine's debut was in the 2017 Grand Cherokee. I'm up for another change soon and will probably continue with the M1, although a bottle of Shell Rotella Gas Truck 0w20 is staring at me from my stash. I got it for free after rebate.