New to the forum and the F150. I just picked up a 2018 F150 4x4 with the 3.5 Ecoboost and right at 90,000 miles.
I just changed the oil, and next tasks are oil in both diffs, transfer case, coolant and transmission fluid. From yall's experience, what else should I be looking at doing? Oh I also plan to swap the thermostat while doing the coolant.
Thanks!!

 

Welcome to the forum! I would check the engine air filter, cabin air filter and spark plugs.

 

Brake fluid flush

 

Already swapped air and cabin filter, thanks!

 

Already swapped air and cabin filter, thought about the plugs as well. thanks!

 

There is an inexpensive water detector for brake fluid, water being the primary fluid contaminant. . I'd use a transmission specialist to check the condition of the transmission fluid before changing it, get their recommendation on how bad the fluid is and service. 90000 miles is a lot on transmission fluid and may be beyond replacement without more mechanical service. Clean all three MAP sensors, the throttle, then run a throttle/idle relearn.
Are you equipped to vacuum fill the coolant? Ecoboost tend to get a lot of coolant voids by just pouring in coolant.
More on my own opinion but CAI and catch cans are not worth the bother. When you do the plugs make sure they are gaped as tight as listed in the specs .028. KM

 

consider a trans pan drop new filter and replace pan with a PPE aluminum pan with drain drain then drain and fill again a couple of hundred miles later