Sediment found in engine blocks is
not necessarily non-magnetic. While some sediment might be composed of materials like non-metallic compounds (e.g., calcium carbonate, silicates), a significant portion can contain ferrous metals (iron) from engine wear – particularly from piston rings, cylinder walls, and other components. These ferrous particles would be magnetic.
Therefore, the magnetic properties of engine block sediment will depend on its composition, which varies greatly based on the engine's condition, age, and the type of oil used. You could find both magnetic and non-magnetic particles within the sediment.
