AC Delco PF63 of GM 6.6l gas. Right at 5k miles on filter, approximately 15k on vehicle. I think that these are hard to beat for the price ( I know that there is a lot of hate for the e-core filters, but I don’t mind them at all. Any early issues have been long since resolved. I used to be a wix fan boy, but since they are no longer made in USA (WL10255 is made in Mexico) and they cost twice as much, I will be using these PF63’s for the foreseeable future.