Any idea why my old man would have run in and out hoses from the oil filter housing to a frame mounted housing to the right of the radiator as you are looking down to it. We just inherited it a few months ago so I took it the a shop to get it up on racks so I could look at everything and noticed it when we went to change the oil. Interesting that the recommended filter is a PH25 but yet is is using a PH8A on the frame mounted housing.