My PHEV is in the garage with its first mechanical problem - the oil seal between the rear axle electric motor and the transfer box has broken, leaking oil all over my new block-paved driveway. The service guy says only one other mechanical problem has been reported so far - a broken oil seal on the front axle. If there are really only 2 problems reported then this would be pretty amazing for a new and technically complex vehicle in the first couple of years of operation. However, it could be that these seals are a weak spot so it would be worth checking under your car for leaks occasionally.