Hey, I tried the Scamazon ones. They are just a 10mm aluminum crush washer. Hecho en China. They don't loosen up or leak. It worked for MY particular application. May not work for everybody. My oil pans are old. ( 03' & 06' ). So maybe there is some seating damage to them over the years. And they are steel. So I take it back. The Scamazon's worked for ME....May not work for every body. I'm sorry

....Now, take me down off the hangman's thingy. Don't kick out the chair under me

LOL