The engine oil systems of certain Mitsubishi applications may produce abnormally high oil pressure, exceeding the structural capacity of standard spin-on oil filters, including the AMSOIL SDF-20. Improper operation of the pressure-regulating valve in the engine causes the high oil pressure, resulting in over-pressurization of the lubricating system and damage to the oil filter. Normal Operation: Valve opens and closes AMSOIL has decided to withdraw recommendation of the SDF-20 in place of the Mitsubishi part number MZ690116 oil filter. The AMSOIL SDF-20 continues to be the recommended filter for many other applications not associated with this problem