One problem related to engine oil leaking has been reported for the 2014 Toyota Prius. The most recently reported issues are listed below.
Dealer mechanics at Toyota berkeley, Toyota vallejo and city in daly city all have stated that the crack in my oil tank is a �well known� manufacturer defect. The mechanics state when building that part, a machine clamped the 2 parts together. But the machine doesn't wipe it down beforehand and any oil will keep the 2 pieces separated, which eventually form a crack. When the oil is left unchanged for a period of time the crack gets bigger, the oil leaks and eventually doesn't work. I was told if I keep up with my regular oil changes, it should work. But I get anxiety now every time that maintenance light goes on and I feel like I have to change the oil immediately or else.