Historically, I never purchased the extended factory warranty, but with my Navigator, I did. Too much stuff I don't know how to work on to go bad. I bought it early during the Covid run up, dealer wanted like $4k, called up Ziegler Ford (always been an at cost warranty dealer), and they did the Lincoln Premium Care (or whatever they call their top warranty) for $995. It covers drivetrain and main electrical components. I bought it with 35k-ish miles, I'm now sitting on 60k-ish miles. In that time, needed cam phasers replaced/updated...was about a $5k bill (at the dealer). Needed trans module replaced...was about an $3000 bill (at the dealer). Needed a rear main harness replaced...was about a $2500 bill (at the dealer). Also needed some emissions parts replaced...was about an $1800 bill (at the dealer). So I'm glad I elected for mine. Randy Marion Lincoln is where I get my warranty work done, and they never had it for longer than a week, which I was thrilled about, and always came with a loaner. For me, these vehicles are just beyond my level of expertise at this point, so I'll probably never own anything newer than 2010 without a warranty.