I did not see your reason why viscosity is higher than COA. It is important to explain why viscosity of Priolube 1939 is out of your COA. Do you understand my point? COA was issued from your side and we also checked its properties against your COA when we received it. So, you need to explain as following;
1. Any reason why viscosity is out of COA?
2. Is it contaminated from previous product batch or not?
3. Could you please use technical method to prove that Priolube 1939 is not contaminated such as IR spectroscopy or etc.
4. Your letter did not say anything why viscosity is out from COA. It is just mentioned that product delivered to PSP is Priolube 1939.
Please tell me if I am over react.