They'll call it a small problem, replace the filter and send the customer a qt of oil. Once the oil lite comes on the damage has been done. It might not be immediate, and that's Amsoil's out, but damage has been done.
How much once again Amsoi's out and anyones's guess. A year two down the road if the car starts blowing smoke or using oil you think Amsoil will help? I don't.
I'll stick with what I can buy locally and change when the mfg suggests. Extended drain oils and filters are not my cup of tea.
Good point Trajan: The last thing Miro wants is anything floating to the surface about his oil. Somethings are best left at the bottom of the sea!