Mobilmet 400 Series Mobilmet 400 Series are high performance, multi-service, non-corrosive straight cutting oils. Mobilmet 420 Series Mobilmet 420 Series products are high-performance multi-purpose cutting oils. They are chlorine-free, non-staining and non-corrosive. Mobilmet 440 Series Mobilmet 440 Series fluids are high performance, multi-service, non-corrosive straight cutting fluids. They are designed for moderate to heave duty cutting operations. Mobilmet 760 Series Mobilmet™ 760 Series are extra high performance neat cutting oils. They are chlorine-free and are intended for severe cutting operations especially on difficult to machine steels.