I will add to this (because I recently overfilled and had to drain some by dropping the oil filter housing), I have found that the bars and the dipstick can read differently depending on whether the car has been recently driven. My understanding is that it takes a while for the oil to drain down into the bottom and be measured. Supposedly (I thought I read somewhere) that the digital bars would account for this, but (and maybe it is just me) they seem to read a little lower after a drive, and then next morning cold it reads a little higher.
I have heard the overfilling is a sure way to kill an AOS.
Steve
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