I'd probably go a little lower - 120⁰C/250⁰F unless you know that you're oven is accurate at those temps.
I'd go 7-8 hrs uncovered to get a nice bark (dark colour) formed then cover & go another 2-4 hrs covered to really soften it.
I finished this one in a steel roasting dish after about 6hrs in the smoker on a bed of sliced onions to stop the bottom drying out. It added a really nice flavour to the gravy that I made with the juices. The last couple of hours were covered with foil.
I wouldn't add liquid because there's a lot of moisture & fat in a brisket. You can though, it just may come out a little mushy on the bottom.
Thank youuuuuuuuuuu! Legend!
I will be sure to smash a note or two about how I go.
Really appreacite it.
Will get the oven cranking soon. 🥰
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Did a success. Much great success!

All at 120°C/248°C. 6 hours in le open Dutch. Then placed on an onion bed. Then another 1.5 hours in le open Dutch. To finish, 2 hours in le closed Dutch.
So friggin good.
Thank you for the excellent advices. 💕🙃
I thought I overcooked it when it looked like this at the 6 hour mark. I was wrong. Hehe. Thanks again. 💕 
Yeah - you can't tell what's going on inside by how it looks on the outside.
It's always better to go longer at those low temps.
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