mysterious nut

MAM

Registered User
hello guys. long time sc owner with a question about a nut that i discovered while doing an oil change about 5 years ago. the nut is visible through the oil drain plug hole, it kinda looks like a connecting rod nut. i have put about another 100k miles since discovering this nut and my engine runs strong with no knocking noises.so i am not worried. just curious as to what it might be from.
 
Probably the nut that holds the oil pickup tube to the main cap stud, or something that someone dropped in there.
 
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