ATF is Automatic Trans Fluid. Don't know much about todays additives. Back in the 50's it was common practice to use non-detergent oil in engines with solid lifters. Intown stop and go driving is very hard on vehicles as we all know and non detergent oil makes this worse.. Now days you need to look for that style of oil. Even with detergent oil back then and a solid lifter engine my dad felt keeping the oil passeges clean as possible was real important.
The only additive I use today is Stanadyne fuel additive in my 6.0 Ford diesel truck. Not only has oil had much of the additives removed so has diesel fuel. Good Luck
