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Go buy an aluminum F150 and never have to worry about it again!*
*=except for all the parts that arent aluminum, like the frame.
Aluminum does corrode. My RAM is waiting for approval from Chrysler to have hood corrosion repaired.
The aluminum fords are held together with rivits.. not welds like Steel. There was a huge thing about replacing parts due to accidents as the rivets had to be purchased in huge amounts and like 500 or 1000 and they only needed like 5. Then the dealers had to throw out the remainder as they were purchased by the insurance company and thus not the property of the dealer/repair shop. This increased repair costs considerably which lead to higher insurance rates.
Aluminum corrodes, not to mention Is has a very limited working or bending/fatigue rate before it snaps. Metal can Bend and bend before snapping and has a much lighter fatigue rate. I’ve seen holes put into the beds of those trucks were a steel truck would only be dented. Remember this is also from a company that puts a ecoboost in the trucks now. I’m not sold on the aluminum crap honestly.
To the OP. There are issues with the 4thgen as well more so the front fenders have a sound insulating foam that absorbes water and rusts through. You can’t really remove as it’s permanetly bonded to the fender with some kind of support. On my 2014 which is “babied” 90% of the time I have a paint bubble on the front edge of the aluminum hood, and some paint bubbling on the rear bumper where the plastic top step edge is as well as all along the bottom edge back/underside.