Ölzunahme - kleine Studie | Posts 48+

hkss wrote:

Triggering the regeneration process every 380 km, regardless of the load factor, is, in my personal experience, quite simply the most ridiculous thing imaginable.

Oh, now suddenly...

On the other hand, this could be a safety precaution. If the system for measuring soot load fails (e.g., a differential pressure sensor is defective, or, or), which happens continuously , the regeneration based on mileage provides the certainty of being able to continue driving. VW assumed a high soot load, which is why only 380 km is allowed. In the spirit of: "Better to regenerate more often than to have to replace the DPF during the warranty period."
You're just experiencing the side effects of the oil dilution, but you also know how to minimize them.
a) to put more strain on the engine.
b) Pay attention to the temperature (thermostat).
c) No long-life service; instead, oil changes are required every 1 year or 15,000 km.

Templogs from...

029 - Oil temperature / Oil level threshold / Wear index / Soot index.

062 - Coolant temperature (engine outlet) / Coolant temperature (radiator outlet) / Ambient temperature / Intake manifold temperature.

067 - Temperature before turbocharger / Temperature inside particulate filter / Pressure difference across particulate filter / Offset of pressure difference.

Oil temperature is currently at 97.20 degrees (20.39 Fahrenheit) with the warm weather (outdoor temperature of 30/31 degrees Celsius). I think that's enough to "burn off" fuel and condensation.

It's interesting to see how the cooler (the coolant thermostat) slightly lowers the water temperature when the oil gets hotter.

Okay, I now have the oil analysis report from the lab.
6.58% diesel fuel consumption over a distance of 7000 km.
The laboratory classifies this amount as "out of specification" and recommends troubleshooting.
"The biodiesel content is essentially unmeasurable (below 0.30), as I have only ever used ARAL Premium diesel."

Distilling fuel from oil is definitely possible with gasoline. However, it doesn't work with diesel, as its vapor pressure is too low at the temperatures achievable with oil heating. It's best to figure out why yours is always regenerating at the minimum interval.

Best regards.
Christian.

Without having to read everything again... Were the sealing rings for the PD elements to be excluded or not?

matthiasTDI96 wrote:

Without having to read everything again... Were the sealing rings for the PD elements to be excluded or not?

In my opinion, it can really only be THEM.
- as I said - in my opinion...

But I have an extended warranty, and if I tell the warranty insurance company about THIS...
If you insist on having an eye exam, I'm happy to perform some preliminary tests at my own expense.

In the VW workshop, they don't replace individual sealing rings - "we only replace the complete units" (direct quote). So, only the complete set of 4 PD elements is replaced.
"When I see and read how to replace seals, all I can say is 'Thank God.' I don't trust any mechanic in any workshop."
dealing with someone else's property, I would trust him with such a task (or would want him to do it).
And if VW can "sell" that to the warranty insurance company, then so be it.
But...
It's not that far along yet.
I need to have a few more conversations with my repair shop first, possibly also contact VW directly, and submit the case to Autobild .

hkss wrote:

In the workshop at VW, they don't replace individual sealing rings - "we only replace the complete units" (direct quote). So, only the complete set of 4 PD elements is replaced.

No. Of course, sealing rings will also be replaced. For example, a new cylinder head is installed along with the old PDE (high-pressure injection pump).

Quote:

Maybe also write to VW and submit the case to Autobild

.
"VW: What do they have, a Golf from 2007?" Ah, I see.

So, I just had a surprisingly quick conversation with the workshop manager.
nachdem ich am Mittwoch ja schonmal "angeklopft" hatte - was wir in meinem Fall machen können. And someone told me:

VW requires a test drive to determine the defect.
Drain the oil.
Carefully measure and pour in the new oil.
Complete a test drive covering xxx kilometers.
Drain the oil.
Weigh the used oil.

Later, Volkswagen will comment on whether the measured increase in volume is outside the specified tolerance. I was unable to find out where the tolerance limit is.

I calculated that in my case, if the test drive is longer than 200 km (200 km is my assumption), then...
My oil has increased in volume by 10ml (1cl).

If (!!) the measured volume value is outside the tolerance, the engine oil must be tested in the laboratory to determine the cause of the oil overfilling.
I have borne all the costs up to this point.

If (!!) the increase in volume was caused by diesel fuel, then...
The solution from VW might be a new AT (automatic transmission) motor, because all other repair solutions (such as tandem pumps or PD elements) would be questionable, and the procedure mentioned above (a test drive) would be necessary.
would be necessary to demonstrate the effectiveness of the measure.

The warranty extension would then - if they don't reject it outright -
Probably a maximum of 30% of the AT engine will be used, but it's more likely to be less. However, it's also likely that they will reject the idea altogether.
If the engine were to fail now, experience shows that the insurance company would currently cover approximately 80% of the total repair costs.
From the insurance company's perspective, their position is also understandable.

Conclusion:
I will be ceasing my involvement in this matter.
The costs, effort, and benefits are not in a reasonable proportion to each other.
I will change my oil every 6-7000 km, and every 20,000 km, I will have the oil analyzed by a lab to see if the problem gets worse.
If I had my own workshop or at least my own garage, I would replace the sealing rings of the PD elements myself, just as a precaution.
It's actually a "nice" piece of work if you enjoy "tinkering" as a hobby.

With such short intervals between oil changes, it might be worth investing in an oil extraction pump that sucks the oil out through the dipstick tube. While you won't be able to remove it completely, it's a very quick process. Oil filter and oil changes by draining, as usual, should then be sufficient at the normal intervals.

Hutfahrer wrote:

With such short intervals between oil changes, it might be worth investing in an oil extraction pump that sucks the oil out through the dipstick tube. While you won't get it all out, it's extremely quick. Oil filter and oil changes by draining, as usual, should then be sufficient at the normal intervals.

Good idea - thank you.

The PD element seal replacement isn't nearly as dramatic as it might seem.

It's mostly just wage labor, and it can even be done in a clean environment, even on a living room table.

"I'd like to get some quotes, if you're not able to do it yourself."

Best regards.
Christian.

Oil analysis, 3rd test (every 7,000 km).
The proportion of diesel fuel in the oil has been steadily increasing.
I have the oil analyzed in a lab and changed every 7,000 kilometers.
Currently, the diesel consumption is 10.4% after 7000 km.
I once read that 10% is still considered an acceptable upper limit.
In the future, I will have no choice but to change the oil every 5,000 km. VW is not interested in the problem with my vehicle.
The logged values (13, 18, 23) and temperatures were plausible.
Well, there's probably nothing we can do about it.

Hello,

The time and cost for the permanent oil checks, as well as the cost of the "extended warranty," constantly adding fresh oil and still experiencing increased wear – for me personally, it's all too much hassle.

Ausserdem finanziell nicht sinnvoll, keine Versicherung der Welt besteht aus purer Barmherzigkeit sondern weil sie damit Geld verdient. Your money.
In the long run, the total premiums paid are always more expensive than the damages incurred.
To that extent, any insurance that covers damages exceeding what one can afford to pay themselves is a luxury.

It only takes 1.5 to 3 hours to replace the seals, and the necessary materials don't cost a fortune either.

Best regards, Rainer.

The tandem pump could also be a potential candidate.

Okay, I'm ready. Please provide the German text you want me to translate.

I don't see that as the main problem with our BMM engine. Compared to the first few months after we bought the Caddy used, the oil consumption has improved.
After now having done the oil change twice, following my set 10,000-mile interval, and with painstakingly accurate checks (that silly dipstick with the balls ), the oil level no longer changes. Although my oil level is always at the maximum mark, it doesn't go above it anymore.

However, I also admit that I'm not exactly the most economical driver here. We try to maintain a brisk driving style, which helps to ensure decent oil and DPF temperatures. This significantly improves the self-cleaning process. This is especially important in the winter. We also often use the premium fuel to keep the biodiesel content lower.

At approximately 40,000 km, the problem of excessive oil consumption hadn't appeared yet, but now, at around 70,000 km, it's present. The laboratory analysis clearly indicates an excessively high diesel content.
There's almost certainly a defect present. If the car is still under warranty, the issue should be formally reported in writing, referencing the oil consumption and the laboratory report. Otherwise, months of pointless comparisons using the oil dipstick and regeneration tests are futile. I wouldn't discuss this with the mechanics either.
Place the oil change invoices and lab reports on the table, along with the observed increase in quantity, and a chronological record of all previous attempts to resolve the issue.
The response must be a repair proposal that identifies the warranty coverage. If the workshop wants to investigate further beforehand, they may do so at their own expense.
"The statement 'complete AT engine' is nonsense; such a thing doesn't exist. It's delivered as a block with a head gasket and a separate cylinder head. At most, the head gasket can be completely (or partially) integrated."
Sometimes, writing a letter to Volkswagen can be quite effective.
If the procedure is too unpleasant, or if the "guarantee" seems ineffective due to obvious partial performance, then have it repaired or have it repaired at a suitable workshop.
hg
Herbert.