Oil decreases the gravitational force on an object. Water increases the gravitational force on an object. The buoyant force on the object in oil is greater than the gravitational force. The buoyant force on the object in water is equal to the gravitational force. Mass is conserved in chemical reactions.
Internal energy is conserved in all reactions.
Charge is conserved in all reactions. Charge is conserved in chemical reactions. Airflow in a warm air furnace. Bonfire heat reaching a camper. Light passing through a window pane.