So in the case of the Subaru with 439K, it's likely the owner got tired of checking the oil, and it was burning so much that things went sideways from oil starvation, maybe quickly or maybe a little at a time. I wish I had a job where I could rack up the miles, I'd buy the same car and aim for higher miles, with a lengthy OCI, I just wouldn't use 0w20 in these things for a minute longer than it would take me to drive home from the dealership.