Looking at a car with a groaning noise when wheel is turned - not terrible - steering feels smooth otherwise. What's the approx cost for a power steering pump replacement?

You might try loosening the pump line and drain old fluid into a bucket while the front wheels are off the ground and turning wheel lock to lock. Put in fresh fluid and you may just notice a difference. Good luck.

Doug,
Cost of new power steering pump is high,..follow advice of southern son, ..drain and refill with fresh fluid. Renew steering filter too if has not been replace. Who knows, ..it might correct this problem.

Going to buy it tomorrow. 86 560sl with 140k for 10,000. no rust, inside clean, has a rear seat, too. My 1st SL to go along with my 420SEL. Steering was my only concern, and you guys have a good idea!

I think that you may be looking at noisy ball joints or a steering dampner making noise. Just something else to think about. Brian