Expensive mower but I've had problems with this thing. Today, I changed the oil and turned it off. I went to fill it up and the oil just kept pouring out. I tied to tighten it etc then it came right off in my hand. I snapped it back on and it finally tightened so that oil doesn't leak but now I'm thinking of it and will have to keep checking on it. I don't trust this plastic crap at at. $4000 mower and they put a plastic twist cap on the oil.