- Sep 21, 2005
- East Helena, Montana
I know that the recommended procedure is to fill the UOA bottle during about the middle of the flow as the oil flows out of the drain plug hole. However, this is obviously going to be at least a bit messy. I've been wondering. Why not just dip the bottle into the oil in the drain pan after all the oil's drained out? Seems to me that would give you a representative sample of the drained oil?