Leasing = incalculable risk?

Hello together, I play with the idea to give my current Mercedes A-Class (W176) at my Mercedes dealer in payment in order to switch to the new model (W177). So far I have always paid directly for my cars or financed through the Plus3 financing, but it was mostly used or annual car. My dealer has now made the following offer: Duration: 48 months – Total loan amount 37.366 € – Special payment 6.000 € – eff. annual interest rate: 1.56% – monthly R at incl. VAT: 255,77 This sounds like very little money for a new car. Now I am not sure, however, if I look over any big hook at the action. I would like to reduce the duration to 24 months with the same special payment. Is it recommended to pay a special payment in this amount to keep the monthly instalments low? What hidden costs (apart from insurance and tax) do I have to pay attention to? ckgabe von Leasingfahrzeuge bei Mercedes? Thank you in advance!