Chris, we have had 3 brand new one's from Toyota fail within 30 seconds of starting the car.
Each time we have put it down to being pinched when being pressed in however we had another one do it on Saturday on a newly built engine, instead of just accepting a bad installation we looked closely at the seal and compared it to another new one, the spring on the failed seal was not as far back as the new seal and was quite loose, we then opened and looked at 5 more seals and found another 2 that were the same as the failed one.
We have sent the seals back to Toyota for inspection and will post the reply when we get one back.