You will get two more oil changes and a brake fluid change. That is $500 worth of servicing for only $3500. Not a bargain in my book. If you were really lucky, you might get a set of front brakes out of it, worth maybe $1000. Still not a bargain in my book.
If it was a CPO warranty and you were worried, two years of major expense coverage for $3500 might give you peace of mind.
I'd put the $3500 in the bank and self insure.