Hello MB fans! Interest me now for a 420SE from 10/1990 with 167TKM and full equipment (leather, 2 airbags, etc.). Would you like to have it converted to LPG. -WHER has had experience with it? -WELCHE LPG system is recommended? -WIE high are the conversion costs? -How is the lifespan then? I am grateful for your tips!