I have been using 2-cycle oil 1oz/1gal and have had pretty good results so far. The truck runs smoother and has a bit better acceleration since I have been using it. Wal-Mart brand TCW-3 ashless is like $9.00 a gallon.
I've only used Power Service Cetane booster (grey bottle). I've had good results with it. Every oil change I treat the tank. As stupid as it sounds, I'm pretty sure it helps my MPG's out. When my MPG's start getting down.. usually after 4k, and no additives and just driving... I'll treat it sometimes and it helps out for a while. Oil changes & Fuel treatments make a big difference on my 6.0. But I like to use products that are available at most stores; I don't go for botique products anymore.
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