One guy got a new engine, the other couldn't prove his innocence since he did his own oil change, and they suspected he was to blame for it. So he had to front his own costs to repair.
If it was dealer serviced for all recent oil changes, you should be covered. If you've had a shop do your oil changes, they will blame the shop. If you had your neighbor do all your oil changes, they will blame your neighbor. See how this works?
