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Dear All,
Our central lubrication using Shell Morlina 220 since 3 years ago, and the last a half year we found if Cu content around 100ppm. TAN value still below 1 and kinematic viscosity increase around 230cSt.
- What high Cu content effects?
- Source of Cu?
- The best way to reduce Cu content in oil?
Please any comments to help us.
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Cu is common to become high, if there is a sacrificed metal component (which mainly composed by Cu) in your gearbox system.

For additional of 30%v of fresh oil, it will correcting the oil properties.
But i do believe that your problem is not the oil properties

Have you try Pentane - Toluene Insoluble test(ASTM D 893)?
Insoluble > 0.5%wt is an indication of task to change your gear oil.

Regards,

Nurudin
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