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Excessive Soot in Diesel Oil #4107275 05/26/16 01:20 PM
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outoforder Offline OP
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My 2003 TDI has shown excessive soot levels in past 2 oil analyses with 4000-6000 miles on the samples. What are the hazards of too much soot in the oil? Will the filter life span be shortened? This is a high mileage car so if I have to change oil and filter more often, no big deal.


2003 Grey Jetta TDI 351,000 miles
2003 Black Solara Convertible 202,000 miles
Re: Excessive Soot in Diesel Oil [Re: outoforder] #4107296 05/26/16 01:52 PM
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2015_PSD Offline
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From my understanding, too much soot that is not held in suspension can accelerate wear rates in the engine. How much was "too much" for your engine?


2019 o)|||||(o Rubicon Wrangler Unlimited 3.6L V6 [Castrol Edge + Mahle]
2018 Mercedes Benz C300 2.0L Turbo [Pennzoil Platinum + Mann filter]
Re: Excessive Soot in Diesel Oil [Re: outoforder] #4107300 05/26/16 01:54 PM
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UltrafanUK Offline
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What was the TBN and insolubles figure in the UOA ??

Last edited by UltrafanUK; 05/26/16 01:54 PM.
Re: Excessive Soot in Diesel Oil [Re: UltrafanUK] #4107341 05/26/16 03:04 PM
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krismoriah72 Offline
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hazards are sludge forming in oil, also carbon in the rings. This is a result of an improper burn, either injectors clogging or intake clogged. With that high of mileage i would just change it more frequent and ride it out. EGR catches up with u on these TDIs.

Re: Excessive Soot in Diesel Oil [Re: outoforder] #4107393 05/26/16 04:11 PM
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Rand Offline
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if soot levels get too high and/or the detergent package is depleted... soot can clump and become abrasive.

What were the actual results... excessive is kinda generic and open to interpretation.


2019 Jeep Cherokee Trailhawk 2.0T
2020 Hyundai Elantra "Value Edition"
Re: Excessive Soot in Diesel Oil [Re: outoforder] #4107456 05/26/16 05:43 PM
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outoforder Offline OP
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From Blackstone: "We don't quantify the amount of soot in a sample as part of the standard analysis, but there was enough
soot in this sample to prevent us from obtaining an insolubles reading. Excess soot can show a combustion issue, but
we're not sure if that's the case since that typically comes with a high viscosity as well. Iron is on the high side of
average, showing more steel wear than normal. Other wear metals are in good shape compared to universal averages,
which shows typical wear with oil run ~8,400 miles. The TBN was strong, but run ~4K miles and check back on iron."

Iron: 94
TBN: 7.2
SUS Viscosity @ 210 Farenheit 68.6
cST Viscosity @ 100 Celcius 12.57


2003 Grey Jetta TDI 351,000 miles
2003 Black Solara Convertible 202,000 miles
Re: Excessive Soot in Diesel Oil [Re: Rand] #4107466 05/26/16 06:01 PM
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Doug Hillary Offline
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Hi,

Originally Posted By: Rand
if soot levels get too high and/or the detergent package is depleted... soot can clump and become abrasive.

What were the actual results... excessive is kinda generic and open to interpretation.


I agree of course and OEM;s condemnation numbers vary according to engine family

Some lubricants will tolerate very high soot levels (much higher that the OEMs allow) but IMO it is best to live below the OEM's limit

DD two strokes had a limit of 0.8% but other engine types go up to 5%

My limit was always the Oil Co's limit for the lubricant it almost coincided with the OEMs - in my case that was 3.5%


Regards
Doug
Re: Excessive Soot in Diesel Oil [Re: outoforder] #4107718 05/26/16 11:57 PM
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zeng Offline
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Quote:
From Blackstone: "We don't quantify the amount of soot in a sample as part of the standard analysis, but there was enough soot in this sample to prevent us from obtaining an insolubles reading.


At what % of insolubles readings would this be the case with Blackstone/typical labs ? blush

Re: Excessive Soot in Diesel Oil [Re: outoforder] #4108054 05/27/16 11:15 AM
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outoforder Offline OP
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Does anyone know a testing company that would quantify soot?


2003 Grey Jetta TDI 351,000 miles
2003 Black Solara Convertible 202,000 miles
Re: Excessive Soot in Diesel Oil [Re: outoforder] #4108222 05/27/16 01:48 PM
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2015_PSD Offline
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Originally Posted By: outoforder
Does anyone know a testing company that would quantify soot?
It is not Blackstone, from what I understand their testing equipment cannot differentiate between true insolubles and soot. I believe that Polaris (Oil Analyzers) can, I always receive a valid soot reading in my UOA.


2019 o)|||||(o Rubicon Wrangler Unlimited 3.6L V6 [Castrol Edge + Mahle]
2018 Mercedes Benz C300 2.0L Turbo [Pennzoil Platinum + Mann filter]
Re: Excessive Soot in Diesel Oil [Re: outoforder] #4108324 05/27/16 04:08 PM
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dustyroads Offline
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Originally Posted By: outoforder
Does anyone know a testing company that would quantify soot?


If NAPA is convenient to you, their kits will give you the percentage of soot and fuel. As 2015_PSD mentioned, Polaris will also give you soot, fuel and throw in oxidation, too.


2013 F150 XLT 5.0 4X4 122k miles
Re: Excessive Soot in Diesel Oil [Re: outoforder] #4109455 05/29/16 05:03 AM
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TiredTrucker Offline
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I get soot level percentage on all my oil sample tests I send into Schaeffer. I have yet to see any sample from Oil Analyzers, Wearchek, and Polaris that did not include a soot percentage. Even local commercial truck lube locations that have one of those on site sample machines shows soot percentage on their reports.


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