I am interested in running an extended OCI capable oil filter for multiple OCIs on the Burb (currently doing 4-5k OCI w/ G-Oil) for both the economics of it and to take advantage of the performance specs of those filters. However, I would like to be able to drain the filter to get as much of the old oil out. I admit that is probably a bit OCD, but isn't that why BITOG is around? The filter on the Burb is mounted vertically with the base facing up, so an ADBV is unnecessary in this application. However, the FU, D+, and PS all have ADBV. So, are there any extended drain oil filters without ADBV? Particularly any for a 2002 Chevy Suburban 5.3L V8?