So let's say you have a 1 or 2 quart accumulator. Your changing your
oil.
Do you open the valve and drain the accumulator, so that
oil is also changed? Unless there is a way to fill it with
oil and pressurize it, this means you have to start the engine and wait for oil pressure. I expect you would want to close the valve until after the engine builds pressure. Then open slowly.
OR
Do you not drain the accumulator and leave the same oil in it. Remember the oil does not flow through it, just in and out. If you only use half the accumulation on starts, half the oil is never flushed or circulated. I'm sure there is some mixing. I'm kind of looking at it this way. I wouldn't change my oil and add in 2 quarts from the pan I just drained out, so I do not like this.