I watched a video on performing an oil and filter change on the transmission, and it seemed pretty simple. I tried to remove the fill plug next to the sight glass with a 3 foot breaker bar, but it was stuck and I wasn't going to chance breaking something by really cranking hard on it. So I ended up taking it to the dealer. They filled it from the plug at the very top on the passenger side, and drained it from the bottom left plug on the same side and made a giant mess. The oil that made it inside is barely over the bottom of the sight glass, so I think I'm going to have to add more. Are these plugs pretty sturdy, or is there a chance that it will break off? Or should I just try to fill it from the top like the shop did?