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I see 2 issues:
1) Car vs bike helmet. Like rattlsnak mentions, they are designed for slightly different impacts. Supposedly, a car helmet is designed for one big impact, while bike helmets are designed to withstand multiple, lesser impacts. There's also often a fire retardancy to the materials in a car helmet, but that shouldn't matter in this case.
2) Age of helmet. Even if it looks pristine, your helmet is at least 4 years-old (and maybe even more if it sat on some shelf before being sold to you?). Supposedly, the EPS (styrofoam) liner chemically breaks down. So (theoretically) the helmet is not as protective now, as it was originally. Because of this, it's usually recommended to replace a helmet every 5 years, even if has no obvious damage.
Having said those things, if you're just intending on using this in the short term (couple test rides where you remember you're riding someone else's bike), even a used helmet is going to be spades better than no helmet at all.
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1987 Venetian Blue (looks like grey) 930 Coupe
1990 Black 964 C2 Targa
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