you'll receive a letter vs a call from your dealer. bmw is sending the letters in waves vs all at once, so all n63's don't hit the dealers at once for service. if you haven't had any issues, you should be ok to wait for your letter, but if you've had engine malfunction (limp mode), check engine lights, odd sounds, etc, I'd call vs waiting on your letter. I've had most of the issues with my x5 over the last year but zero on my 550
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