This is the first year I owned my 560SEL. I spent about $2500 on maintenance and repairs. This included the timing chain, front brakes and rotors, rear suspension nitrogen cylinders, hoses, belts, all new fluids, an a/c hose, a repair to one of the hoses for the suspension, some suspension parts, and a handful of other things. After I found this site, the repairs came much cheaper! I probably could have saved at least $500 had I known about it sooner!
I think the future, "normal" years will be about $1000 a year, including fluid changes and preventive maintenance. Pretty cheap, really. I do my own repairs, and buy my parts on line of course! The gas is what costs the most...at about 15 MPG, I cringe at the pumps!
1989 560SEL (172k)
1989 325IC (122K)
2004 Suzuki Volusia LE (3500 miles)
2005 Yamaha Road Star (20 K miles)