You'll get further by being honest....and it's always easier to remember the truth. I think Roush will take the motor apart, find the cause of failure, and if it is 'materials or craftmanship' they will do the right thing. If it is an owner error (
oil cooler lines backwards, filter problem etc..) they may recuse themselves. I have found that most people, if approached honestly, will be honest in return. If however, you begin a relationship on a lie, you are headed for misery.