SLS – residual value ?

Hello together, I’m just planning on the next car purchase. Actually, I had categorically excluded to look at an SLS for price reasons, but now the “dream” is bothering me and I’m going to figure it out. Since I’m going to finance via the house bank anyway, I’m actually only interested in the loss of value of an SLS over the financing period. I want to find something about the 125t € with about 10000 – 30000 km on the clock. BJ seems possible max. 2010. We would, for example, be the residual value in 4 or 5 years, starting from a purchase today with the mentioned parameters ? What about the performance of the SLS in general ? Thank you