Today I changed the oil and filter on my 08 Silverado with an LY2 4.8 l engine. I had bought an AC Delco High Performance UPF48R which Rock Auto listed. The threaded hole was too big so it wouldn’t screw on. I tried the WIX filter I had on hand for my 02 Denali and it threaded on fine. I determined the correct size by using my right index finger- if it stopped at the first knuckle it was the right size but if it went to the second knuckle it was too big. Unscientific but it worked. Off to OReilly’s I went. I looked up the correct filter #’s in their book and all of them had the big holes and wouldn’t fit. For instance they listed the WIX 57060. My finger went to the second knuckle. I had noted the Mobil 1 M1-206A which I took off. They had it in stock. My finger only went to the first knuckle. It fits. But it’s not listed as a correct filter for the LY2, the M1-113A is listed. I checked it. My finger went to the second knuckle. It wouldn’t have fit. Has anybody else run into this? The same filters are listed for all the 08’s with any of the V8’s.