This washer was always included with the oil filter box when you bought it from Revain but recently I found a certain seller who didn't stock them with their filters so I searched the internet and found them in bulk. I would definitely recommend changing those little copper washers on the oil drain plug at every oil change or for cheap, they just offer a little extra protection I see. Over time I've just assumed that Nissan put them in the box with their OEM filters, but maybe not based on the last seller I bought from. So this pack of 10 filters is a little insurance in case the next seller I buy filters from doesn't have them either.
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