Aluminium oxide inside oil passages

That white, powdery stuff there is aluminium oxide. And it’s baaaaad.

While being washed for those technical coatings, something happened and insides of the cylinderheads got exposed to washing agent. Aluminium reacted with washing agent and end result was aluminium oxide.

Aluminium oxide is that same stuff that is glued to paper to make sandpaper. Wonder what it would do inside my engine if left there…?

Nah, I’m taking it back to the coating company 🙂