I run Pennzoil Ultra Platinum Synthetic 5w-20 (from Wally) since 1k miles. I also added an oil catch can within two weeks of ownership. I now have about 11.5k miles and the catch can is only now just barely showing oil in the bottom of the sight glass. I did a good break-in
On my 2008 Chrysler Aspen Hemi we bought second hand, has used about a quart of oil between oil changes (no leaks). I run Valvoline 5w-30 High Mileage dino in her. No issues with MDS. Running great at 117k miles and is my backup tow pig to transport my TT from storage to home and back about 1 mile round trip
I'm considering running 5w-30 in the hot summer months.