Well, I used to work on Macks, but the oldest ones I messed with were made in the late 70's. They were about the same as newer Macks. Two spin-on oil filters on the driver's side, under the oil cooler, and a centrifugal oil filter inside a canister beside the spin-on filters. The canister had a 1 1/2 inch rubber drain hose clamped to the bottom of it. I think your truck is the same, but I'm not sure.
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I think the devil drives a T2000.
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