One cannot/will not argue successfully with a non-user/non-believer. Ya hafta go by, IMO, 2 things:
1, have peoples "problems" been "solved" by use of said supplement, as in, were there problems before use...are the problems "gone" after use.
and
2, are you willing/able to spend some cash on said supplements and give them a try for yerself?
if you answer "i don't believe them" to
#1
and answer "no" to
#2
Then supplements are not for you...and you probably already knew that.
I use Archoil oil additive, I believe it did fix an issue my truck was having, I now use it in every oil change
i used the Archoil fuel additive. Did not feel any positive reults, I do not use the fuel additive.
I also use 2-stroke oil in the fuel...thats the only fuel additive I use. I have used others and nothing made the truck turn into a corvette on steroids magically. I use the 2-stroke to lube the fuel system due to less sulfur in the current diesel fuels.
Also, on a side note, I have read that if you add 2 ounces of Unicorn pee mixed with some Fairy Dust your truck will perform like a Corvette on steroids...But the stores around me do not carry the Unicorn pee or fairy dust suitable for use in diesel engines.