Well the Impala one came off no sweat and as a bonus didn't require and additional parts and drained less than 1/2 quart of oil. Pull the filter, put a 1" deep socket on the "nut" of the threaded sleeve the oil filter threads onto. Tread that out and under it was the regular factory "nut" and filter post was underneath. So just move it out of the way and thread the filter back on. I do see a NOS factory system is $600 on ebay (the list on the part is $950!), so maybe we should pull it all off and clean it up and try and get $100 for it. This style doesn't work as a warmer as it has it's own little air cooled radiator mounted in front of the regular radiator so there is no warm coolant covering the coils. Here's what the ebay one looks like
