A couple of weeks ago my race weekend was cut short by something virtually unheard of: GT3 oil pump failure. A crack running along the base of one tooth of the impeller locked the unit up. We're not sure how the keyway could be stressed, and none of the very knowledgable Porsche guys that have seen this ever recall anything like it. Luckily only bearing damage, but note how the shaft was twisted off at the drive splines. Incredible.