If you are on any DOT tire, 18psi is really low. You dont gain any extra grip by dropping your tire pressures like that.
This could be any number of things, could even be the Guibo or CSB. I would check to make sure all your lugs are torqued down, and none are cross threaded.
As mentioned above. Much more info is needed...
Also if happened to purchase new lug nuts, make sure they seat properly on your wheel. BMW uses conical bolts, if the wheels don’t have a conical seat, it could cause serious issues.
Last edited by Discostar; 09-10-2011 at 08:36 PM.