- Iron (Fe) = the wear of gears, bearings, shaft, cylinder walls and pistons?
- Chromium (Cr) = parts coated with chrome, such as rings, cylinder, etc.?
- Lead (Pb) = The wear and tear. The metal coating on the bearing of a rod?
- Copper (Cu) = the wear of piston rings. Screw compressors, etc.?
- Tin (Sn) = the wear of piston engine?
- Aluminium (Al) = the wear of piston valves?
- Nickel (Ni) = the wear of bearings such as shafts, valves and Valve guide.
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