Most anything will work as cutting oil for a drill bit. I'm assuming that you're asking about it for a drill bit and know not to use cutting oil with a dremel cutoff wheel.

I like Aerokroil as a cutting oil for such situations. Wouldn't hurt to try to get some around the screw and bang on things with a hammer before trying to remove it. I've never seen a better penetrating oil than Aerokroil, although it's hard to find. Try an industrial supply like Fastenal as a source.

Best of luck with it.

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2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

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