The interesting part here is that Carmax extended warranty offers these used cars with a CarMax warranty cost, bumper-to-bumper warranty that lasts for 6 full years. This is often in contrast to, say, the Mercedes-Benz Certified Pre-Owned Carmax warranty, which lasts for one year, during which Mercedes-Benz executives devote half their day to paperwork and therefore the spouse to pray that they do not suffer a catastrophic breakdown.