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I had the same problem. What helped with mine is I rechecked the torque on all the bolts/nuts and found that it needed a slight more snugging after some time and heat. The gasket will bed in sometimes not perfect notably on the exhaust manifold side which gets extra heat etc. My Dad who is a former race engine builder suggested I use a good quality rtv silicone and apply a thin bead to the inside of the gasket seat on the valve cover and then place gasket. I will try that on my wife's x3 I'm doing this week. Just a thought.
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2005 X5 3.0, 6MT, Alpine White on Truffle Brown, Sport, Preim, and Cold Weather, Alpina Stainless Headers, AFe Intake, UUC SSK, OEM 87's, 3.64 Differential Swap,Performance Modified Euro 2 Tune, UUC LTW Flywheel and HD clutch, Bilstein B12 Suspension kit
Future mods ZHP/Schrick Cam Shaft upgrade, Operation code name: Doppelschrauben-Kompressor
Wife's Ride: 2011 e70 X5 351 M///Sport.
Also in the fold: 2004 X3 3.0, 6MT, Black Sapphire on Terracotta, port, Premium, Cold Weather.
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