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I have been running JB3/JB4 for 12000 miles with no problems.
Take the thing out whenever you take the car to the dealer. Clear you codes. If you have a JB4, it will clear the codes for you. If you have a JB3 you will need a BT tool if you want to do it yourself.
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2006 E90 330i (retired)
2009 E90 335i (retired)
2012 E70 X5 50i M Sport (retired)
2016 F10 535i M Sport
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