Wouldn’t be the problem. I only ever put in 6.5 quarts since not all the oil drains out. Check the level with BimmerLink the next day after the first drive and it always shows either 98mm or 99mm. A level of 97mm equates to roughly 6.6 liters.
I’ve had this happen before and I’m not tuned at all. Apart from exhaust and air filter I’ve got nothing different from stock and I can’t imagine either of those would have anything to do with this. Seems to just be a characteristic of the B58.