OMEGA A What must mab consider?

Hello am from another forum, but would have asked a few questions about the Opel OMEGA A 2,0i 116PS . What do you have to consider with this one? If you buy it if you buy it. Where does it rust most, are the spare parts cheap? Is the 2liter a worry child? How much km does the machine do? Teeth belt or chain? When to change? Fuel belly? Please just tell me a few things about the Omega A 2,0i Would have a few caravans to choose from. Are all 1992 year.