I've got a v6 2015 explorer, and a 2011 v6 F-150. Both have 55k. Lots of short city driving with the occasional out of town trip. Live in north Texas panhandle.we get big temp swings and lots of dust. I've been using Valvoline syn in the explorer but just got the f150. Wondering if I should switch to PP of something different. Should I use an additive like Lucas? Any other tips for long term Maintance? Are y'all a big fan of the occasional fuel treatment for long trips to keep things clean or does that even work? If you have legit experience and facts, I'm all ears.