As Brian said this will soften tires, but it also will draw the natural oils out of the rubber. I used Zylol from Lowes and its the same mixture your talking about. It softened them real good but really dried them out and they would get harder after a few days. Then they got so dry the rubber started to crack. Brian has some good preps that are very easy to use. It will be more cost effective to get a duro dropper and tire conditioner from him and save your tires, than buy a new set of tires after running the ones you got. I spent $50 dollars on his Pink panther conditioner and his monster duro droppera quart of each, and they are lasting quite a while.