I thought I'd by a pack of 12 oil filters since you get a better deal versus buying one at a time.
The filter I have been using is the AC Delco PF63 with part #89017525, and it's a normal looking filter when you look into the top where the threaded part is.
But, when I got the pack of 12, it is AC Delco part #19330001 and the part where the treads are is flat and it doesn't look the same.
I'm sending them back regardless cause I'm not using these... but, I'm curious what is the difference between these two?
Is the one with part #19330001 got the plastic inside or something?
The filter I have been using is the AC Delco PF63 with part #89017525, and it's a normal looking filter when you look into the top where the threaded part is.
But, when I got the pack of 12, it is AC Delco part #19330001 and the part where the treads are is flat and it doesn't look the same.
I'm sending them back regardless cause I'm not using these... but, I'm curious what is the difference between these two?
Is the one with part #19330001 got the plastic inside or something?

