its not the oil its the springs, you can adjust the tension with the collar on the shocks, or change out the springs, some people use heaver shocks to prevent preload,preload is when you car bottoms out when you land a jump,soft springs means you dont bash manly for on road no off roading, play with the collar, it does make a difference,hears a pic of 2 different springs, the white ones r stock the red ones r revo