[Jake Raby]

I've had great luck using a mineral oil to flush the system between changes of oils. This is something thats imperative when changing between different groups of oils.

As we work to finish the completion of our oil we've found it imperative to run a flush fill prior to a service fill of the new oil. This is because of the polymers that are found in some oils that are not compliant with other oils. When we sell the new oil, the first order will have a flush fill as well as a service fill...

Not all oils are the same, but I've always gotten better UOA samples in regard to the TAN when I have used a flush fill between changing oil types.