my guess is they won't do the paperwork on any other warranty other than the one smart sells - so, if after the factory warranty expires you need something fixed, you'll have to take the responsibility of getting the necessary authorization from warranty direct for the repairs, then probably paying the smart dealership/service dept out of pocket for the repairs, then submitting the reciepts along with proof of payment and the claim number back to warranty direct, where they will then draft a reimbursement back to you in 4-6 weeks or whatever they deem appropriate.