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11-12-2018, 02:18 AM | #1 |
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Brown coloured residue inside oil fill / rocker cover?
Only noticed this recently due to a potential buyer pointing it out. His mechanic advises that the engine needs rebuilding (!) but can't provide any detail on what specifically the issue would be.
The engine runs perfect. Has had genuine OEM oil every 5000KM. Any ideas what this residue is? It it is a bit loose and can be wiped off with a finger and turns into tiny black seemingly carbon particles. My initial research is that it's caused by not enough driving and deposits of moisture and acid which would otherwise be vented through PCV if I were to drive normally at full temperature for long enough. This makes sense as I haven't been able to drive it much for a far amount of time.
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11-12-2018, 02:29 AM | #3 |
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Yeesh. Looks like you most likely need head gaskets providing that grey sludge is caused by coolant in your oil.
If that's the case, the engine doesn't need rebuilding necessarily, although it would be hard to tell if the diluted/watered down oil has caused any excessive wear to internals. I'd get a second opinion on that grey sludge, and I wouldn't chance even starting the car again until you do. EDIT: Do an oil change first. If the oil looks fine it might just be oil and condensation accumulating around the filler cap. If your oil looks milky/murky, all signs point to head gasket.
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11-12-2018, 03:39 AM | #4 |
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its just the valve cover coating coming off. you can clearly see it flaking off in the first pic. get new valve covers.
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11-12-2018, 04:28 AM | #5 |
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Is it painted on the inside?
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11-12-2018, 04:33 AM | #6 | |
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Quote:
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11-12-2018, 04:43 AM | #7 |
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It's apparently pretty common. I wonder if the new Shell twin power oil is more suceptible to it versus the Castrol TWS?
https://www.bimmerfest.com/forums/sh...t=rust+oil+cap https://forum.e46fanatics.com/showthread.php?t=393687 https://www.bobistheoilguy.com/forum...&Number=901313 Might see if the PCV valve needs replacing...
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11-12-2018, 07:27 AM | #8 |
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I believe it's a coating process rather than paint.
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11-12-2018, 08:17 AM | #9 | |
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Do I really need to spend $1000 to replace or is this just cosmetic?
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11-12-2018, 08:19 AM | #10 |
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I also note that the new one from Turner has a grey interior colour"
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11-13-2018, 12:05 PM | #12 | |
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Cmon man |
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11-13-2018, 12:56 PM | #13 |
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Milky oil is a sign of moisture, can be as simple as condensation from not warming up enough to burn it off.
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11-30-2018, 07:15 PM | #14 | |
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Normal.
deansdimmer shared some info on this. Quote:
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07-30-2023, 06:20 PM | #16 |
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Read the posts above. It's not sludge. It's valve cover coating flaking off.
Go to n rw-design.com and order a set of their aluminum valve covers. Lifetime warranty and cheaper than original. |
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