Thought I'd show you guys my 1965 Allis Chalmers Buda 4BD153 diesel bypass filter system. I'm restoring this old forklift and went to change the filter and realized it was a bypass filter. There is no full flow oil filter, but instead a Napa 10 um bypass filter. I've got no idea how many years or hours are on the filter, but I cut it open to see if there was any nasty stuff in the filter. I found no metal or any debris and took an oil sample to have analysed. Here's some pictures