Try to get the neoprene (expensive) valve cover gasket AND matching grommets. There is no torqueing or re-tightening because the grommet sleeves get bottomed out and the grommets determine the clamping force on the gasket. Be very carefull to tighten evenly though.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)