Hey guys I could really use some help. I finally completed the rebuild and started my X5 yesterday. It actually ran terrific to my amazement! However when I turned it off I noticed a terrible oil leak below the exhaust headers. So I'm assuming my 1st valve cover replacement attempt failed somehow. Does anyone have advice on how to bulletproof this procedure? I have several types of sealant should I use one?

Thanks in advance!

Robb