I have a 2015 Ford Expedition with Gen 1 Ecoboost V6 (twin turbo), HD tow package - rated to tow 9,200lbs.
Since new, after the factory break-in oil, I have used PUP 5W-30.
I was towing NJ to FL my boat and trailer weight about 5,500lbs and the SUV was also pretty loaded with stuff.
The boat...