I open this plug on what I thought was a gear box cover oil fill but the hole was dried so I started to fill it with 75-90 gear oil but it started to leak. I took the cover off and realized that there weren't any gears and the cover had a manufacturer little hole that most be for in case some oil escape from the engine. What I don't understand is what the 2 plug on the cover are for. Any help will be highly appreciated. Thank you!
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