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Weird glue/gum/yellow stuff in engine bay

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    Weird glue/gum/yellow stuff in engine bay

    I cleaned my engine bay this weekend. ON the driver side strut tower and all over the parts in that section there is a yellow goo almost like a paint over everything. I got most of it off with a steamer but some of it is very stubborn. I have no idea what the material is. Any ideas what it is and how to remove it?

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    #2
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      #3
      Probably cosmoline residue from the original shipment overseas. It's basically a quick rust preventative.

      Allegedly, kerosene (or WD40) removes it, but I've not personally tried on the paintwork.

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        #4
        see above. the stuff is a wax. 90% isopropyl can take it off with a lot of work. mineral spirits can likely as well.

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          #5
          Yup, cosmoline. I use it as an "originality" marker when inspecting old bmw's. You'll find it on a lot of older models.

          If isopropyl (IPA) doesn't cut it, step up to acetone. However, be sparing as it can affect the paint if you're not careful.

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            #6
            I've used "extra strength" engine degreaser with some success.

            Worst case you can step up to gun cleaner, but don't let it sit on the paint or it will strip it right off.
            Good for those really tough areas though.

            Be aware that cleaning off the cosmoline starts you down a rabbit hole for engine bay perfection











            Last edited by Panici; 02-15-2023, 05:58 AM.

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              #7
              Originally posted by Panici View Post

              Be aware that cleaning off the cosmoline starts you down a rabbit hole for engine bay perfection
              ^ Sound advice here.
              That's why I've left the factory corrosion protection on my engine bay 'as is'.
              Sure, keep the engine bay clean, but if you're after pristine clean - it's a slippery slope my friend...

              That's why I backed away from that rabbit hole.
              E30 320i vert
              But daily drive is Volvo V60 Polestar

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