You have oil in your antifreeze and antifreeze in your oil should you drain it before using steel seal?

i have a 94 Cadillac sls and i think i blew a headgasket thers oil in my antifreeze resovar and thers antifreeze in my oil whats the best thing to do does steel seal realy work should i drain both of thoes before i use it Yes, but any sealant that's to be used in the coolant system is for emergency situations. It will cause more problems in the long run than it will fix. From the sound of your problem, you need to see a qualified mechanic.