01-22-2018, 03:18 PM | #1 |
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Engine Surface Corrosion in 2018 F80?
Ideas on what this is or what could be causing this??
I did a Euro delivery of my 2018 M3 in August and took delivery of it in Seattle in early November. After its long drive home, I washed it using the two bucket method then kept in the garage so thus far, it hasnt seen snow, road salt or anti icing chemicals. When I opened the hood in Dec to start some winter mod projects, I saw what appears some surface corrosion that perplexes me. I was able to wipe some of it off but am curious if anyone has more insight on this. The only other time Ive seen this is on an old E36 M42 that I bought used and was never able to completely remove it so Im wanting to avoid/prevent this from covering my whole engine as it did on the E36. Last edited by Zermatt; 01-22-2018 at 03:29 PM.. |
01-22-2018, 03:55 PM | #2 |
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salt or mineral in water.
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01-22-2018, 04:56 PM | #3 |
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Stop washing your car with Perrier
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01-22-2018, 08:13 PM | #4 |
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Mine looks the same
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02-10-2018, 03:22 PM | #7 |
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It's very likely oxidized aluminum (Al2O3) which can be caused by any corrosive chemical that reacts with aluminum (ammonia or salt or something like that).
I looked at an alpha romeo the other day and it had it with no miles. They said the details shop sprayed something and it happened. https://photos.app.goo.gl/p9laY9IAh9nsxe0g1 I would perhaps try in a small inconspicuous area to remove the oxidation with a very light acid from a lemon (citric) or diluted vinegar (acetic). The acid will remove the layers of heavy oxidation and then the aluminum will immediately grow a thin self protecting layer of self terminating oxidation. This may result in making the entire surface gray though. But perhaps a uniform dull gray surface is better than a spotted surface. Whatever you do, absolutely do not us steel wool or sandpaper as the metal(s) will embed itself and will rust (oxidize) and do bad things. |
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02-10-2018, 07:45 PM | #8 |
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No issues on my 2015 or my 2018 F80s.
About eight washes, rain exposure, etc.
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08-23-2019, 05:46 PM | #9 |
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08-23-2019, 08:17 PM | #11 |
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09-04-2019, 02:29 AM | #14 |
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I used to wash my cars and motorcycles with soft water spicket from my house. Until I realized it was corroding various exposed metals on my bikes. Maybe that caused it.
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10-14-2019, 07:08 PM | #17 | |
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Quote:
Mine does not seem to have gotten any worse nor does it seem to be pitting the surface so I'm thinking it's good to go. |
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10-14-2019, 07:50 PM | #18 |
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Correct. "Stainless" steel is very similar, although you don't see the oxide layer like Al.
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10-14-2019, 09:16 PM | #19 |
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Aluminum will retain it's strength properties even with a surface layer of aluminum oxide. Same modulus of elasticity, same tensile strength, etc.
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10-15-2019, 08:51 PM | #21 |
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10-17-2019, 12:44 AM | #22 |
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I used some mother’s metal polish and that took care of it. Also polished up the top of the intercooler and it changed to a different shade of color lol... looked like a lot of oxidation built up and it cleaned it up nicely.
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