I would like to know what are pros and cons of different instruments for elemental oil analysis (e.g. FTIR, ICP OES, RDE OES, AAS, etc), used specially for oil analysis in order to evaluate and diagnose the root cause of wear? Although I usually end up with ICP OES as the most suitable instrument for hydraulic oil analysis, I would like to know how suitable are other instruments for oil analysis and what are their setbacks and error biases?