Are you guys sure that you can just flush radiator and go green when it calls for dexcool? I believe that I am experiencing the same prob. I have flushed twice, but am still getting some residue on the radiator cap. Also the resivoir tank looks to have the same prob. I took this out and tried to clean with hot soapy water. the stuff is greasy and does not come clean easily. I have also heard that the old green antifreeze has a silicone lubricant in it where dexcool is different. I am not sure if you can simply switch to green. please someone clarify this.