Nope, not kidding. Do a search here (this forum or BISTOG) Most engine flushes ARE kerosene. A modern SM rated oil, even a group 5 synthetic will not clean..sorry.
I used Lc20 on my lexus, wifes car and my Kubota tractor…I did this based on advice from my oil testing house.
I have pictures too.
djspawn00'
I like Lc20 for a flush (16oz) AND then dding 2 oz every 1,000 miles to engine oil.
It WILL remove carbon, sludge, clean rings, keep acids in oil down (near zero), reduce wear (bigtime) etc.