Ever hear of Sea Foam?

Has anyone here used an additive called Sea Foam? I found out about it on another diesel site. So far II have used it in the fuel tanks of both vehicles listed in my sig and really like the results. The directions say that it can be added to the engine oil before an oil change. Has anyone been brave enough to do that? I know of someone who did that in a Powerstroke. I am tempted on trying it in my wife’s 300TDT about 40-50 miles before the next oil change, but I wanted to check here first. What do ya’ll think?

Here's a link. Sea Foam

Thanks,
cmichalik