"Can anyone tell me do you have that problem I am having ,my 2007 530i(has run flat tires) rear R/L both losing pressure 15psi within 5-7 days.I left my car at dealer twice and NTB for 3days ,they DIDNOT find any leak any where and they told me those tires has long life,what should I suppose to do ?Suppose I buy those expensive run flat tires and problem still donot go away?"

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