I purchased my F150 in May of 2003; it’s been 9 years and 402,000 miles later! I’ve yet to have any trouble other than routine maintenance. I’ve replaced 3 things in 9 years: AC condenser, defrost fan and alternator. I used 5-20 motor craft synthetic blend oil and no problems!
I like to commend you on your craftsmanship; I’ve got one tough truck!