Keep your fingers crossed! If it works, you probably want to do a coolant flush and get all that oil and junk out of the cooling system. Pretty easy to do with a Prestone Flush kit from your local autoparts store. If it doesn't work, do the coolant flush, and try the K&W Headgasket Sealant treatment. Do a web search on it and you'll see how to do it. Thing is you can't add it to antifreeze but most users also say it works great (only about $8.00).