Fita Punto oil pan?

So hello, aloso on my Fiat is the oil tray just before rusting through!. ATU wants 300 € but that can’t be a witchcraft or? So I got brakes if I see the right thing the tub is only fixed with a few bolts or? Ergo oil drain oil tray unscrew new to oil filter change new oil pure finished! Hab I forgot something or can correct me jmd! To clarify would also be how much liter of oil this Fiat with its 55ps needs! Greetings Daniel