Through the place I work at, I can get Baldwin filters for really cheap. Mentioned it to my buddy and he said to get a case of filters for his 4.8 chevy, I change his oil every 5k miles and it seems like a waste to keep using Fram Ultras and TG's like I've been doing. My question is, although the Baldwins seem well built, are the efficiency ratings good? I read on here somewhere posted that the efficiency is no better than the AC Delco PF48 that the 4.8 Vortec calls for. Any truth to that? If so, I think they would be more than good for a 5k oil change. My other question is, if he would decide to let the OLM run down to 0%, should the Baldwin be capable of handling it, even with a nitrile ADBV? Most Baldwins seem to have louvers instead of holes, should that pose a flow problem? The filter is a B160. I can get a dozen filters for $34. Thanks guys