By "prime" them, I mean do you add oil to the filter before you screw it in place? I know a horizontal mount won't allow for this, and obviously any type of cartridge filter.
But I always do on all 3 of my cars, and notice the oil pressure comes up much faster, by not waiting for the oil pump to fill the filter, before it pressurizes the system. This is especially true on my older F-150, 5.0 V-8, and my 5.7 HEMI. They both take the larger, full sized spin on filters, that hold quite a bit of oil.
The filter on my F-150 is on an angle, but I can still get a lot of oil in it, and not have anything leak during installation.
The filter on my 2.5 Toyota Camry is microscopic, (my coffee cup holds twice as much). But I still prime it with as much as I can get in the thing. It mounts fully vertical.
But I always do on all 3 of my cars, and notice the oil pressure comes up much faster, by not waiting for the oil pump to fill the filter, before it pressurizes the system. This is especially true on my older F-150, 5.0 V-8, and my 5.7 HEMI. They both take the larger, full sized spin on filters, that hold quite a bit of oil.
The filter on my F-150 is on an angle, but I can still get a lot of oil in it, and not have anything leak during installation.
The filter on my 2.5 Toyota Camry is microscopic, (my coffee cup holds twice as much). But I still prime it with as much as I can get in the thing. It mounts fully vertical.