A powder metal blend for making a powder metal part especially a valve guide 14 for an internal combustion engine particularly suited for operation where there is little or no engine oil lubricant at the valve stem 30 and valve guide 14 interface. The first feedback signal is based upon anticipated state changes and is typically represented by a state propagation model. First, this provides a stringent framework for designing a questionnaire and study plan which will lead to clear tab plans and analysis plans. The wipes are pre-moistened with a solvent.