Is this metal washer necessary (doing an oil change)?

Hi guys,



I usually buy Wix branded oil filters and have been doing my own oil changes for a while. For the first time, I bought a Toyota OEM filter for my Corolla. But I noticed that the dealership included this metal washer for my drain plug:







Is this piece necessary? Because my existing oil drain plug seems to hold up just fine without it.

Is this metal washer necessary (doing an oil change)?