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ces3857 posted on r/chevysonic3w
It’s a check valve. I had to replace it on my 2012 when I started getting a low oil pressure light. It’s $15 on Amazon Engine Oil Cooler Filter One Way Valve Compatible with Cruze Check Opel Vauxhall Astra Aveo Sonic Trax Orlando, 5541525 12992593 55353322 93186324 https://a.co/d/0bDefCTr