Oh it's real, but it's not called engine seize. I work at a GM dealer and we have launched 4 "clunker" engines so far. E&W block seal is the product that we are using. Silicone silicate, liquid glass. Dump the
oil, put in 2 quarts of this stuff and run the motor till it quits. Tears up cyl walls and most everything it touches, then hardens to consistancy of steel.