reservior

Hi again Under the wife's W210 E320 CDI bonnet, on the right hand side as you look at the engine, is quite a large reservoir that says "Hydraulic oil" on it. I am guessing that is for the power steering, but I have never seen a clear reservoir for that, they are usually black, so wanted to...

I am going to retrofit the heating element for the windscreen reservoir into my one on my W208 320, but Does anyone know where I get the water feed for the element ? Many thanks