The availability of the ACDelco PF63 filter seems to have really expanded. My local Wal-Mart had a ton of them. I decided to go ahead and use this instead of the PF48 on my '13 Silverado. My thinking is that it is clearly superior to the PF48 as they are using it on the new 2014 Silverados. Also, the PF63 fits the cutout in the oil pan of the '13 perfectly. Having seen the TSBs that indicate they (PF63) are to be used in place of the PF48 on the large unibody SUVs to allow more surface area for better performance I can't understand why anybody wouldn't upgrade on their Vortecs that use the PF48.