Turn harder. lol. But really try to find some kind of extension to put on the ratchet to get more leverage. Or try spraying some nut loosener on it. I always use this stuff called loosey gooesy it works on anything. And yes I just said nut loosener.
When I change my oil, I use a long (11") ratchet wrench for extra leverage, and then I literally have to do a pull-up on it to break the drain bolt loose. That bolt just seems to tend to work itself tighter -- I don't overtighten it when I put it back in.
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