Well,
Just saw an update that Amsoil has decided to recommend oem intervals on some of their filters. Eao13 included for many models. That is a pretty common filter. I wonder what this means when using other Eao13 or 51356 manufactures filters. Maybe running your P1 for extended drains isn't a great idea anymore? I can't imagine that a Ea filter would reach maximum capacity faster than a P1?
http://www.amsoil.com/eao_change_intervals.aspx
Just saw an update that Amsoil has decided to recommend oem intervals on some of their filters. Eao13 included for many models. That is a pretty common filter. I wonder what this means when using other Eao13 or 51356 manufactures filters. Maybe running your P1 for extended drains isn't a great idea anymore? I can't imagine that a Ea filter would reach maximum capacity faster than a P1?
http://www.amsoil.com/eao_change_intervals.aspx