How many km on it now, and warranty start date, I'll get you a dealer cost on it.
An IAP Superior warranty, assuming it has 40k on it now and inservice date of May1, 2011...
7 year 100 cost $1370
7 year 140 cost $1689. They have a guaranteed price refund option, for an additional $250 if you don't use the warranty they refund $1500 at the end. Give the guy a couple of C notes for margin, $2139 gives you coverage to 2018, if you don't use it it cost $639 for some piece of mind.