The other possible problem with using Motor Flush is that what ever crud it doesn't dislodgr, it will loosen up a bit. Then it may come loose after you have filled up with new oil and start driving. So you could have little bits of crud flowing around and and could plug up passages. As Larry's infamous saying goes, "change it HOT and often".

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member