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".
1994 MB E320 Coupe (199,500 mi)
1992 MB 190E 2.6 (173,000 mi)
1983 Porsche 911SC (148,000 mi)
2004 Volvo V70 2.5T (198,000 mi)
President of CT/Westchester Section