I promise you transmission fluid has NO WHERE near the cleaning properties that motor oil does. I dont know how that ever got started but transmission fluid has virtually nothing in the way of cleaning abilities.
Now what I could 'possibly' conceive it doing, since its a thin oil, on the thin side of a 20 weight motor oil, is maybe allowing the engine to run warmer and maybe burn some stuff out but thats a stretch at best.
You want serious engine cleaning ability, pick up a bottle of Auto-RX. By far, bar none THE best engine cleaner man has ever known.
