Vane Pump - Failure

Dear Experts

We are making use of Tonna 68 for Hydraulics system
To ensure online filtration, we make use of Ferrocare make online filtration system - but we are not using it regularly and may be due to that color of oil became black and pump failed to develop pressure

Can any of you please suggest if Spin 2 oil can be used to flush out entire system - just in case any of you having similar experience because ambient temp goes even upto 45 degrees in this part of India during summer

Regards