I have 219,000 miles on a 2017 Ford explorer xlt 3.5 NA. Owned since new.
I drove it directly from dealer to home and installed Amsoil svg 75w140 in PTU, amsoil fuel efficient atf, Amsoil 75w90 svg in rear axle.
PTU is still orginal. Every 50k I change spark plugs and flush radiator fluid and...