Question on S54 cold start idle I recently bought a used 06 Z4M with low miles (11k now). On cold start the rpm rises to about 1200 and blips very briefly between 1000 and 1200 before dropping to an idle of about 800. Also the idle vibrates just a tiny bit (enough to be noticeable). My service advisor says this is normal for an S54 engine but I'm not so sure. Is he right?