I'm using Rotella T6. I believe that the zinc content is around 11 ppm . Given that this and other additives are lower than period oils of the 70s, I'm searching for oil with more protective additives to help minimize wear.

From prior reading here, some folks use Amsoil or Lubemoly (?) from Napa which is both synthetic and has been formulated with these older engines in mind.

I haven't read too deeply on the subject, but it seems that Cat offers a wide range of engine oils that might also work.

Cat Parts: Parts>Machine Fluids>Oils>Diesel Engine Oil

Given the range of Cat equipment out there of varying ages and their long experience keeping machines running, I thought they might know a thing or two about what it takes to keep an engine running smoothly.

I'm not interested in another synthetic vs dino debate. Just the merits, or lack thereof, of Cat DEO.

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1974 240D "Boldie" 170K.- New timing chain/freshly rebuilt IP/replaced valve seals/injectors/upgraded stereo/new Bilsteins with Yokohamas/fresh paint and rocker panels plus lots of welds.