Ölzunahme - kleine Studie | Beiträge 48+

hkss hat folgendes geschrieben:

To trigger the regeneration process every 380km, regardless of the load factor, is, in my personal experience, essentially a waste of time.

Oh, now suddenly...

On the other hand, this could be a safety precaution. If the system for soot loading fails (due to a faulty differential pressure sensor, for example), which happens frequently:evil:, the regeneration after a driving cycle provides the security to continue driving. VW assumed a high level of soot, therefore only 380km. Basically, it's better to regenerate more often than to have to replace the DPF under warranty.

You have to accept the side effects of oil dilution, but you also know how to mitigate them.
a) put more strain on the engine
b) pay attention to the temperature (thermostat)
c) do not use longlife oil, but change it every 1 year or 15,000 km

Templogs from

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

062 - Coolant level / Engine outlet / Coolant temperature / Radiator outlet / Ambient temperature / Intake air temperature

067 - Temperature before exhaust turbine / Temperature in the particulate filter / Pressure difference in the particulate filter / Pressure difference offset

Oil temperature now at warm weather (30/31°C outside temperature) 97.20°C - I think this is enough to "boil" the fuel and condensation water)

It's nice to see the coolant (coolant thermostat) regulating the water temperature slightly downwards when the oil gets hotter.

Okay, I now have the oil analysis report from the lab.
6.58% diesel fuel at a runtime of 7000km
The lab classifies this amount as acceptable, but recommends further investigation.
(The amount of biodiesel is essentially undetectable (less than 0.30), as I have only been using ARAL Premium diesel so far).

Refining fuel from crude oil works reliably with gasoline. However, it doesn't work with diesel, as its vapor pressure is too low at the achievable oil temperatures. It's best to find out why yours always regenerates in minimal intervals.

Best regards,
Christian

Without re-reading everything...Were the PD element sealing rings to be excluded or not?

matthiasTDI96 hat folgendes geschrieben:

Without having to read everything again...Could the seals for the PD elements be the problem, or not?

In my opinion, it's probably just them.
- as I said - in my opinion...

But I have an extended warranty, and if I can show the warranty insurance that this is the problem, then I'm happy to have them inspected at my expense "before".

In the VW workshop, they don't actually replace the seals - "they just replace the whole thing" (original quote). So, only the complete 4 PD elements are replaced.
If I see and read that seals need to be replaced, I can only say "Thank God". I don't trust any mechanic in any workshop to handle someone else's property.
And if VW can "sell" this to the warranty insurance, then I don't care.
But...
it's still a long way off.
I need to have a few conversations with my workshop first, maybe even write to VW and report the case to Auto Bild :roll

hkss hat folgendes geschrieben:

In the VW workshop, they don't replace just the seals - "they just replace the whole thing" (original quote). So, only the complete 4 PD elements are replaced.

No. Of course, seals are also replaced. For example, a new cylinder head + old PDE are installed.

Zitat:

Perhaps also write to VW and report the case to Auto Bild

"VW: What do you have, a 2007 Golf" aha, so so.

So, today I had a surprisingly quick conversation with the workshop manager,
after I had already "knocked" on their door on Wednesday - which we can do in my case. And they told me:

VW requires a test run to determine the fault.
Drain the oil.
Fill with new oil, precisely weighed.
Perform a test run of xxxkm.
Drain the oil.
Weigh the drained oil.

Later, VW will comment on whether the measured volume increase is outside the tolerance. I couldn't find out where the tolerance limit lies.

I calculated that, in my case, it would be expected that if the test drive is made over 200km (200km is my assumption), my oil would increase by 10ml (1cl).

If (!!) the measured volume value is outside the tolerance, the engine oil needs to be checked in the lab to determine the cause of the oil increase.

I am responsible for all costs incurred to date.

If (!!) the volume increase was caused by diesel fuel, then
the VW solution would be a new AT engine, because all repair solutions (torque pump, PD elements) would be questionable and the aforementioned procedure (a test drive)
would be necessary to prove the success of the repair.

The extended warranty would then - if they don't completely reject it -
likely cover a maximum of 30% of the AT motor, but probably less, however, it is more likely that they will completely reject it.
If the motor were to break down now, the insurance company would typically cover 80% of the total repair costs.
From the insurance company's perspective, this position is also understandable.

Conclusion:
I will stop my activities in this matter.
The costs, effort, and benefits are not in a reasonable proportion.
I will change my oil every 6-7000km and have an oil check done by a lab every 20,000km to see if it gets even worse.
If I had my own workshop or at least a garage, I would replace the PD element seals myself - just in case.
It's actually a "nice" tinkering job if you enjoy "tinkering" as a hobby.

Given the short intervals between oil changes, it might be worthwhile to purchase an oil suction pump, which can be used to suck the oil out through the dipstick tube. While it won't remove it completely, it will do so very quickly. Oil filter changes and oil changes via draining should still be sufficient at the normal intervals.

Hutfahrer hat folgendes geschrieben:

Given the short time intervals between oil changes, it might be worthwhile to purchase an oil suction pump, which can be used to suck the oil out through the dipstick channel. While it won't remove it completely, it will do so very quickly. Oil filter and oil changes via draining should then be sufficient at the normal intervals.

Good idea - Thanks.

It's not really that dramatic, the PD Element sealing replacement.

It's mostly just labor, and can even be done on the living room table under verschandeln conditions.

I'd be happy to get some quotes for you if you don't want to do it yourself.

Best regards,
Christian

Oil analysis, 3rd (every 7000km).
The proportion of diesel fuel in the oil has now continuously increased.
I have all the oil tested and changed at the lab every 7000km.
Currently, the diesel content is 10.4% after 7000km.
I once read that 10% is considered a critical upper limit.
Therefore, I have no choice but to change the oil every 5000km in the future. VW is not interested in the problem with my vehicle.
The logged values (13, 18, 23) and temperatures were plausible.
Well, I guess I can't do anything.

Hello,

the time and cost for the regular oil checks, as well as the cost of the "extended warranty", and the constant need to refill the oil, all while experiencing increased wear and tear, seems too much to me. :roll:

Also, it's not financially sensible either. No insurance company operates purely out of charity; they make money. Your money.

In the long run, the total premiums always exceed the actual claims paid out.

Therefore, any insurance that covers damages that you couldn't afford yourself is a luxury.

You can replace the seals in 1.5 - 3 hours, and the necessary materials aren't expensive either. :wink:

Best regards, Rainer

The tandem pump could also be a candidate.

/viewtopic.php?t=20974

I don't see this as the problem with our BMM. Compared to the first few months after we bought the Caddy used, there has been an increase in oil consumption.

After having changed the oil twice according to my 10,000-mile interval and with very precise monitoring (that annoying dipstick with the balls ), the oil level no longer changes. While my oil level is always at max, it no longer goes above that.

However, I must also admit that I am not particularly frugal. We are trying to achieve a brisk driving style, which ensures decent temperatures in the oil and DPF. This makes the self-cleaning function much more effective. In particular, this should be taken into account in winter. We also frequently use Ultimate fuel to reduce the proportion of biodiesel.

Around 40,000 km, the problem of the miraculous increase in oil consumption hadn't occurred yet, but now, at around 70,000 km, it has. The laboratory analysis clearly indicates an excessive amount of diesel.

Therefore, there is definitely a defect. If there are warranty or guarantee claims on the car, the defect will be formally claimed in writing, with reference to the oil increase and the laboratory report. However, the months-long haggling over oil sample comparisons and regeneration tests is pointless. I would definitely not discuss this with the mechanic.

Bring the oil change invoices and laboratory reports to the table, along with the observed increase in oil consumption, and a calendar listing of previous attempts to claim.

The response must be a repair proposal with identification of the warranty service. If the garage wants to investigate beforehand, that's fine, at their own expense.

The statement "complete AT engine" is nonsense, and it doesn't exist. The engine block with the crankshaft and cylinder head is delivered separately. At most, the crankshaft can be completely (or partially) integrated.
A letter to VW can sometimes be very effective.

If the process is too cumbersome, or if the "warranty" is clearly not being honored, then repair or have it repaired by a suitable garage.

hg
Herbert