Cummins to 5.7 to Cummins again

Hello to the big boy side from the 1500 side of this forum. I previously purchased a 05 Laramie 5.9 the day Katrina hit. Fuel supplies were getting scarce and I feared not making my long drive back from the fly n buy. It was a great run of 12 years with that truck. Life got busy and the truck was in need of more and more maintenance so my simple plan was to get a new 1500 and not be concerned with vehicle distractions so I could focus more on work. What a fail. 2017 limited and 2019 Limited became more problematic than my old 3rd gen. I'm sickend that I let the 3500 go.
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Getting out of the fifth gen 1500 and about to buy another Cummins. My knowledge of these fuel systems comes to the same fundamental conclusion. Lubrication. I made my own biodiesel for years and it is imo the thing that kept my engine and especially the fuel system happy. Well that and Rotella. My question is if this is needed on the 2020 systems and is bio available and are Cummins operators using it?
I'm also interested if anyone else has had a simular fail going to the light fuel side?

Well I used to think bio diesel was the best kind of fuel to run in a diesel engine, but read something a week or two ago that has made me rethink that but I honestly can't remember what it was ( hate getting old). It really doesn't make much difference to me because I have searched for bio diesel sources and what I have discovered is that they are few and far between, at least here in Colorado. I run conventional diesel fuel and add Power Service that has a Cetane booster in it. They make the white jug with an anti-gel agent or the silver/gray bottle that is for summer use, but I run the winterizer treatment year round because I buy it by the case from amazon.com. Its much cheaper by the case than buying a bottle at a time locally. I have had my 2011 2500HD CTD for nine years and 79,000 miles and have had the ECM and the fuel control actuator replaced as well as the turbo. I went with a fleece turbo instead of the Fiat Chrysler. I believe the ECM could have shot the craps on any vehicle on the road, they are probably sourced from the same manufacturer for all vehicles. My truck is delete tuned and the turbo kind of surprised me that it started throwing the CEL and fault codes, but such is life.

Thanks for the response. Giving the 4.5 gen hd a test drive tomorrow