Originally Posted By: Garak
Sure, they tell one tiny piece, but without that tiny piece, UOAs lose a pile of their utility. There's a reason to get a VOA of a batch before using that oil in a trended analysis.
Agreed. If someone is doing UOAs, then it's good to have a VOA as a baseline to understand whether certain elements found on a UOA came from the original oil or from the engine.