Please help clarify my confusion. The latest warranty PDF from Tesla list a 4-year Basic warranty and unlimited miles/time battery warranty when you have an 85kW battery. However, tens of stories on the Web from 2014 state that there is an 8-year warranty on the powertrain. I see no such coverage mentioned in the Tesla official materials. Is there, in fact, a longer warranty on the drive units? Was it ever there? If so, did Tesla quietly pull it? Thanks.