I asked in your introduction post how many miles, which I see here.
Glad warranty is in place.. did they give you a estimated time on replacement, or details on what happen?
A lot of people are still shy about voiding their warranty on a $40K (or $50K in some cases) truck..
I'm assuming he's tuned his EcoDiesel's. So he should have some good info for us as far as gains, MPG gains, etc.
My dad uses S100 on his Harley, but I've never thought about using it on the (truck) motor.
I've used this:
and it works quite well.
Might try the S100 if you like it...