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    Re: Experience with an artifical horizon
    From: David Iwancio
    Date: 2020 Oct 18, 10:07 -0700

    Re:  used motor oil

    Part of getting "used" means picking up some rather nasty stuff both as combustion byproducts and from engine wear, including heavy metals.  It's stuff that typically goes out the exhaust pipe, but some doesn't make it that far and instead gets collected and concentrated over the useful life of the oil.

    I'd guess it's safer than undiluted mercury, but that's not a very high hurdle in my opinion.

    (Heck, I used long-life synthetics just so I can deal with the stuff less often.)

       
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