1990 Mercedes-Benz 560SEL Questions

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I hear body squeek noises when driving, like dry rubbing noises.
What seems to make the problem better or worse? it doesn't stop unless on freeway with no variations in surface.
How long have you had this problem? 2-3 years getting louder
Runs good when warmed up
I could use a fuel line diagram, fuel seems to be flowing backwards.
its a 1988 not 1990
In looking over the car I recently bought -- 1990 560SEL with 114,000 miles -- when I had the brakes redone the shop I went to told me they detected leaks in the manifold gaskets. I have no performance issues, not sure I trust the shop who I think thinks I am a little old lady who knows nothing about cars and will repair whatever they tell me to repair. I don't know a great deal, but I used to own a Super Vee race team and so saw a great deal even though I never wrenched on cars myself; think there should be some performance issue connected to the problem they say I have. Is there any way I can tell whether they are telling the truth apart from taking it to someone else?
starts when i spay starter fluid in air cleaners area,so fuel related,changed fuel pump relay ,same,probably fuel pump or is there some hidden fuse to lookout for maybe under rear seat
why engine oil can run into my car steering box
car was stored for a while, ran rough, tuned it, ran better, but then died and no spark.
Just bought a 1990 560 Sel. Yesterday it drove and more importantly braked nicely. Today, after 24 hours of close to zero temp, the brakes were pretty much not there. Only went around the block, decided against further driving. Is this a problem likely caused by the cold?
occasions I replaced the fuel pump relay prior to the last incident what could be the problem
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