That's an old wives' tale.
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I always wondered about that, thank you for debunking the myth for me. An old mechanic friend told it to me years ago and I always thought it was a little fishy, but when I saw the seal leaking that was the first thing that came to my head.
I took the cap off and took a picture for you guys. I’m not sure what indicators to look for beyond scorch marks and bits of metal, but everything looks ok to me.