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In general, metal-based detergents are used in engine oil to prevent the adhesion and accumulation of deposits and sludge. Because metal-based detergents are additives composed of fatty acid metal salts and carbonates, such as calcium, they are known to be easily affected by water. In particular, over-based metal-based detergents containing a large number of carbonates, which are excellent in terms of detergency, have been used often in recent years. Following the increasing use of biofuels and the diffusion of hybrid vehicles, the risk of water being mixed into engine oil has increased. For example, in hybrid vehicles, it is assumed that the engine oil temperature decreases and it becomes difficult for water to volatilize. Also, the E100 fuel contains several percent of water.