http://www.1st-in-synthetics.com/zmax.htm
check this and u will relize almost all "additives" are a piece of ----, just throw some sythetic oil in ur engine if ur looking to waste some money

 

i think those tornado things might work a little, kinda like rifling a barrel. probably helps air get around all the fluting in the air intake. they could spend about the same money and get some 180degree bends and cut them up to get the same effect, so they dont have all that gay *** fluting, do they actually think the engine moves that much

if you read the article you notice other companys such as Slick 50 , Prolong ,and others were also worthless.

If you wanna waste money buy some 0w30 or 20w50 2000series Amsoil at almost $9/quart. That ---- is about the best u can by. They have articles on there site that explain that some syntetics aren't really syntetics but rather a play on "scientific" terms

heres a link putting Amsoil against popular Synthetics
http://www.1st-in-synthetics.com/dyno_test.htm

which include some peoples beloved Royal Purple
alos a link to test against Redline
http://www.1st-in-synthetics.com/redline.htm

iam not trying to sell you on motor oil but do your research, the average consumer is easily mislead.