I thank you for you valuable input!
my car uses/burns some oil between oil changes, at 5K interval i'd say about 1qt or less; I plan to use Mobil 1 HM Synthetic for next time, so meanwhile is there any traditional way to test the O2 for its function, or is it possible for the sensor to go to off and on randomly, and should I use fuel cleaner to benefit the sensor for example
needless to say, I registered my cars last month, so the repair could wait; but at the same time, I like my M6 so Ill be continuously proactive about it