BukvaMan

If anybody is familiar with it, how much of it should i put in the tank and is it ok to use it while having half a tank of gas or should i wait till empty and put it in while filling up again to mix it better.

it says it treats up to 100 gallons per 15oz bottle but its also recommended for a good first clean up to use a full bottle on one tank of gas.

SouthernBoy

As I recall, this is one of the really quality products out there. Do a search for SI-1 and see if you can turn up some discussions on this perhaps four to six years ago.

Crestwood1001

Where is I Hate Cars?! He can tell us all about this.

maknwar

Ive used it. Dump it in on a empty tank, then fill up with gas. That way it gets stirred up.

SpiderX1016

I tried it once, I just threw in the whole bottle.
I don't think these are strong enough to damage anything. Maybe coat the spark plugs red.