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I have over 63K miles on my diesel Excursion (7.3 PSD) and have never added an additive (and I haven't had any problems with it either). I'm getting ready to go to the river this weekend and just picked up a quart of the stuff and now I'm having second thoughts. The fuel tank is full, all I gotta do is pour it in.
I have been using Howes Diesel Treat sucessfully since I bought my X in 03. Picked up 1 MPG and my filters look better at chamging. My Mechanic says it's keeping the injectors clean too.
Have never used Sea Foam in the Diesel, but have run it in my cars and the boat. Worked wonders in the Maverick after it had sat in a garage for almost 2 decades.