so I've recently learned about sudoedit and how I can edit a file more safely than the standard "sudo vim".
the problem is now, when I'm in vim and "vsplit" or "tabnew" I open it as my user account (no root privileges)
Maybe you just want a option to save file as sudo.
You can find mapings for write file as sudo or use tpope enuch plugin.
You will get :SudoWrite and :SudoEdit commands and couple more.