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My mower seems to be an "odd-ball" and I can't find a manual or info specific to mine.
My mower dumped all it's oil. I think I need to replace the o-ring. Cannot find specific manual or videos.

Briggs and Stratton Bolens by MTD 500 series 158cc

model/type/code: J0L62 4457 F2 12041451

Correct model number is 10L602-4457-F2 see if that helps you out.