Questions about the S80…

Hello, So we’re also thinking about buying a S80, which is why I have a few questions: 1) Does the S80 petrol engine have the Euro3 or Euro4 standard? 2) How much liters are the 2.0T/180PS versions on average? 3) Could you mount the facelift rear lights + front with an S80 MJ.01? 4) What is the difference between the sound systems “HU-601 RDS” and “HU-801 RDS”? 5) Could you install the instrument cluster from the T6/Facelift into a normal S80? 6) How expensive are the inspections? On Mercedes level? and for the time being the last question: Are 16.90€ for an S80 2.0T, which ran 55,000 km, built in 05/2001, leather, Navi RTI and a Webasto stand heater is in order? Or could you still do a bit (financing) at the price? So, these are many questions, but I hope you can answer at least a part of it. MfG Juggy D