Hi, Recently my steering has started to get noisy. I'm sure I'm just low on fluid but I've found no leaks. I've looked in the bently manual and the BMW manual but the photos they have for the power steering reservoir don't match what's in my car. I have a suspect but I don't want to put fluid into the wrong place. It's a metal canister with a screen on the inside at the top & there is no dipstick or visible level marked inside the canister. Here is a photo: Thanks for any help!