I ran across this stuff the other day. It's not the same as snake oil.
The directions say that immediately prior to an oil change, pour the solution into the crankcase, idle engine for about 5 minutes, then change oil and filter as normal and fill with clean oil.
The theory is that it removes oil sludge and deposits that will rinse out immediately with the removal of the old oil.

What do you guys think??

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2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)