Not stupid, and i apologize if that was the inference from my post. Seafoam is usually used to clean high mileage, heavy carbon deposited engines--which your 2021 cummins is not (at this point at least).
No additives are required and you wont be asked to provide any proof that you use any should you need your truck fixed under warranty. That is enough for me to know i dont need to use any.
Now... the additive topic itself is wildly debated (especially with the 19-20 CP4 guys) and most will tell you to use some form of Hotshots treatment. I think the CP4 guys like the LX4, if i remember correctly.
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If i am going on vacation towing our 14k 5er, i will add 8 or 10 oz of Powerservice to my tank to add some lubricity. But otherwise, for daily driving, nope... no additives for me.
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