I am going to be pulling the head off my 300TE again over Christmas break and redo it since I am losing oil out the back.

I followed the procedure for torque..I don't really understand why it is seeping out there. I triple checked the valve cover, even swapped it out with another one with a new gasket and it still leaked. It was fine for about 5k miles then started leaking. I had the head skimmed and pressure tested so it still should be flat.

Do I need to purchase new head bolts after 8k miles since the replacement? I went with VictorReinz before...Should I go to the dealer and get the head gasket with them? What brand is OE?
Getting my part list together now....

Anything else I should do to make sure it does not leak this time around?
Thanks

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k