Sludge signs after Oil change on my 07 E320 OM642 - Mercedes-Benz Forum
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post #1 of 13 (permalink) Old 10-27-2018, 09:09 AM Thread Starter
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Sludge signs after Oil change on my 07 E320 OM642

I used 2 bottles (1L total) of liqui moly engine flush just prior to my oil change. Draining the old oil didn't result in any chunks of sludge or debris in the oil but my magnetic oil drain bolt did grab what appeared to be sludge. Have a peak at the picture. I also pulled my intercooler off thinking it will have crap load of oil but no, nothing! Just oil condensation. I had the intercooler standing up right thinking some oil will drain but nothing. So that's a nice surprise.
Visual inspection through the oil fill cap and down the oil filter valley doesn't reveal any sludge. I'm thinking of scoping the oil pan.
This time, I changed my oil at 9,000km and purchased dealers 5w30 229.52. It's not cheap. 😕
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post #2 of 13 (permalink) Old 10-28-2018, 01:02 AM
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I hope you send sample to the lab?
Strange as I torn apart my old 2008 engine and at 180k miles not even slightest sign of sludge.
Could be different oils, or different temperatures?


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post #3 of 13 (permalink) Old 10-28-2018, 07:10 AM Thread Starter
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No I didn't even though i had the sample kit ready. There were no signs of any sludge before and at half the recommended change interval I didn't think it was needed. I noticed this buildup of on the magnet after so yes next time I'll send a sample in for analysis.
This was MB oil that I drained but before I had Amsoil.

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post #4 of 13 (permalink) Old 10-28-2018, 04:41 PM Thread Starter
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Small update. It was suggested that this magnet buildup is not sludge but sub 20 micron metal particles and the magnetic drain magnet is doing its job. If in fact that is the case, I better send oil for analysis!

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post #5 of 13 (permalink) Old 10-30-2018, 07:00 PM
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From my mechanical experience what I see on your magnetic plug doesn't look like anything to worry about. I'd just change the oil sooner.
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post #6 of 13 (permalink) Old 10-31-2018, 02:46 PM
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Rubbing the residue between fingers, or white paper towels should show if that is sludge, or steel dust.


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post #7 of 13 (permalink) Old 11-01-2018, 11:45 AM
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Originally Posted by Kajtek1 View Post
Rubbing the residue between fingers, or white paper towels should show if that is sludge, or steel dust.
Collect "sludge" in plastic dish then see if attracted to magnet?


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post #8 of 13 (permalink) Old 11-01-2018, 12:32 PM Thread Starter
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I think it was both. It had grayish metallic colour on the white rag as whipped it off the drain plug but when I picked it with my fingers I was able to roll it like a nose booger

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post #9 of 13 (permalink) Old 11-01-2018, 01:43 PM
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That sounds like metal shavings with oil attached to them.
To some degree normal, but too much for my taste.
I would keep an eye on it and definitely send next sample to the lab.
What oil did you use?


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post #10 of 13 (permalink) Old 11-01-2018, 04:01 PM Thread Starter
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I drained MB (I think it was MB 0W30) Oil but before I had Amsoil. Now I filled up with MB 5w30.

The ultimate ignorance is the rejection of something you know nothing about and refuse to investigate.
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Last edited by EFSiR; 11-01-2018 at 04:14 PM. Reason: Oil weight
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