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Plastic Deformation (PD)
A plastic deformation transmission fluid is specifically designed to protect from the formation of microscopic cracks / pitting due to high load pressure within the system. The design of these oils is a surface improvement additive and aimed at equalising pits and (or) rough faces during high load high friction carrying.
When using PD oil always make sure that it is a manufacture requirement rather than a problem solver as similar symptoms may occur due to overload.