If you catch it soon enough it might now have done much damage. About 10 years ago I bought a Bronco. It had an oil leak but I didn't realize how bad it was and ran it out of oil to point where the motor was making a knocking noise. I immediately shut it off and topped off the oil. The knocking went away and it continued to reliably serve me for many more years.
However, I'm trying to imagine what kind of noise a motor would have to make for someone other than me to notice that my M62 isn't running right. At this point, multiple oil bearings are probably suspect to damage.
It is strange that you're getting misfire codes. I think they're probably unrelated.
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