Mostly agree with above. First: absolutely on the torque wrench but as mentioned above, I would probably add 10% to the factory spec torque then add some angle to that as long as the final torque was still no more than 15-20% extra. These are probably a stupid small amount of torque like 8-10 N·m so three final result woukd be 9-12 N·m of torque. With numbers that small it's extremely important that a torque wrench is used.

Also: this thought is only "punting" the inevitable, but I'd do it if it means I can do the gasket change next year vs this year.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)