Suggest you use a breaker bar or torque wrench long enough so you can get some leverage. Sit in seat, put your knees and your right hand on the steering and offset the created torque from the wrench when you pull down. That way you won't take the chance of hurting anything and if the nut doesn't break loose you either need to do some weight lifting or get a bigger wrench There is no locktite that is designed strong enough to withstand more than the appropriate wrench on that size nut and shaft.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas