ATF is just 20W motor oil without combustion bypass control products installed. No special cleaning power. While diesel-rated oils are better at containing combustion products -- longer, mainly -- they aren't really high detergent in the sense of "cleaning" an engine.
You all can go over to BobIsTheOilGuy.com to read up on engine cleaning if you want. Thousands of threads.
AUTO.RX is the one I've been using for the past eight years. Another is LUBE CONTROL LC-20 that I've been using for almost 40.
Marvel Mystery Oil is over-rated, as is RISLONE. Both use the kind of solvents NOT good for engines.
Follow directions on above products and you'll be fine. I've had some engines never opened after the factory built them thirty and more years ago and the above products will help them maintain proper lubrication. On the ones I have these products got rid of any sludge and a lot of varnish. Easily, effectively, gently.
As to filters stick with BALDWIN B2-HPG or DONALDSON P169071 as these are low-restriction, full flow, high capture products. The "HP" filters on the shelves at the Zone tend to be high restriction, not good for this or any engine. WIX and others are simply not in the same category.
The oil analyses I've run on the 4.0 bears this out. Also, put some cork gasketing under the valve cover inlets/outlets. If you see oil on the outside of the motor, that means that dirt and water (increased condensation) are getting IN the motor.
Good luck
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