I have pretty much used AC Delco oil filters on both of my NNBS Silverados (AC PF48) since I owned them. I have been an OEM oil filter guy even when I owned an Explorer(Motorcraft FL-820S). After doing some reading it appears that AC Delco is headed to make ALL their oil filters those el-cheapo E-cores. When/if that happens I will no longer use AC Delco oil filters. My last trip to Walmart it looked like all the AC Delco oil filters besides the PF48 were E-cores. My question is are there any filters to avoid using on the 5.3L engines. Reason I ask is that when I had my 1998 Chevy C1500 with the 4.3L engine if I used certain filters the engine would rattle when I started it. The problem went away as soon as I put an AC Delco PF52 on it. Now there are some over at Bob is the Oil Guy that say that AC Delco classic oil filters are only good for ~5K miles and if you want to get the most out of your synthetic oil to run a filter like a Fram Ultra, Mobil 1, Purolator PureOne, K&N, etc. Just wanted others thoughts on the matter. Thanks.