Tesla Motors has a way with words.
From Superchargers to 'auto pilot,' Tesla likes to set itself apart by calling things other things. What, fast charging and autonomous drive not good enough for ya? The same thing just happened with the announcement of a new 'infinite mile warranty' for the drive unit. That's infinite, not unlimited, but whatever it's called, the new policy lifts the warranty mileage cap on the 85-kWh version of the Model S that had previously been set at four years and 50,000 miles.
The new rules say that the drive unit will have the same 'limits' as the battery pack, which means as many miles as you can put on the car in eight years. Tesla will also honor the warranty no matter how many people have owned the car and is applying the warranty retroactively, so feel safe buying that used 2012 Model S until 2019 if you still want some warranty coverage.