Ölzunahme - kleine Studie | Posts 80+

'Na Prost Mahlzeit' - An 18% diesel content in 4.3 liters is almost 0.8 liters.
Okay guys, if you ever find yourselves running low on oil in the future, you can confidently use the diesel pump at the gas station. When refueling, you can also use the pump nozzle to fill the missing volume with diesel directly into the oil filler neck.

I was just thinking the same thing!

If it weren't so sad, it would be funny.

HI,

How will diesel engines behave in the future, especially considering the increasing use of alternative fuels?
Will he "burn out" if he drives on the highway for a longer period again?

Then the following could happen:

Before starting my vacation, I had a lot of "max" M&Ms.
Drive 1300 km west, arrive with just a tiny bit of fuel left... and still have the return journey ahead?

m;

Something might happen when the oil temperature reaches around 140°C.

I would consider "cooking" diesel fuel out of oil to be unproductive.

But the issue has now resolved itself, hasn't it...?

After I had first resealed the PD elements, and after...
Approximately 3500 km ago, I noticed that the engine oil level was rising and increasing significantly. I then replaced the tandem pump.
Now, after driving 7000 km since the tandem pump replacement, here is the lab report, as proof.
5.42% diesel fuel in the engine oil after 7000 km, which isn't exactly good.
It's really very little, but at least it's half of what it was in the last analysis.
And as you can see, the percentage of diesel continuously increased. If I hadn't done anything, I would probably have about 12% diesel content now.
"as stated in the lab report."
So, in a way, I was able to stop the negative trend and move towards a...
Lower the somewhat reasonable standard.
Considering what the CASTROL laboratory wrote to me, I can probably be satisfied now.

Well, there was also the hope that replacing the tandem pump (after the PD elements had already been re-sealed) might have made a difference...
Here are the results of the latest lab analysis, after the usual 7,000 km (Last time, before this oil change, I didn't have the oil analyzed).
Over 10% diesel content.
But, as mentioned above, I don't care what CASTROL and VW say about this being normal for these engines - I don't want to drive around with more than 0.4 liters of diesel fuel mixed in with the engine oil.

Hi,

After reducing the oil levels in the BMR and BLS to a measurable level by suction, I also suspect that the BLS is accumulating diesel fuel.

The BMR "consumes" oil easily - of course, it's a 16V engine, and it's sometimes driven with a bit of power.

The BLS ("Bureau of Labor Statistics") shows "none" ... but I suspect there's actually an increase... and the reason for that is clear.
Here's the translation:

"Also, why: The city, short distances, even your regeneration cycles – it all happens in the city. (The BMR would rather have walking kilometers on country roads to finish its business)."

I'll keep observing for now.

m;

Most people don't even realize what's going on.
A friend of mine is incredibly proud that his diesel car has 340,000 kilometers on the odometer.
It doesn't consume any oil and has never needed any oil changes at 30,000 km intervals.
He doesn't want to hear that this might be a misconception, because the oil consumption could be offset by the addition of diesel fuel. He also doesn't have his oil checked.
What's the point? Well, actually, I really envy him.

Blessed are the unaware.

But honestly, many technical topics are much easier to understand if you don't overthink them. Sure, if the machine then breaks down, you can still loudly complain about VW .

Quote:

Blessed are the ignorant icon_smile.gif

Let's say you had burned the money that was spent on oil analyses, etc., in diesel fuel.
How many fewer active regeneration cycles would have been possible with this, or by how much lower would the diesel injection have been?

You mean just driving along a country road comfortably (without a specific destination, which would affect the analysis), just to keep the DPF nice and warm and passively regenerate it.

Whether I should "thoroughly test" our BLS...

m;

Quote:

You mean, just driving along a country road comfortably (without a specific destination, which would affect the analysis)...

No, but rather drive the vehicle with a driving profile that is appropriate for its design and intended use.

I think my motor is regenerating too often.
Driving style, whatever.
I understand that it would be better for fuel dilution in the engine oil if I drove more aggressively.
My engine always needs regeneration after 380 km. "In the past, I always had the laptop next to me, but nowadays I use the daily mileage counter to shift the regeneration phase onto the highway, which almost always works."
And in this process, the loading factor is completely irrelevant.
The regeneration process occurs after 380 km, even though the load factor is only 3% up to that point.
I've noticed/observed/logged this countless times using VCDS.
The loading coefficient clearly shows the benefits of moving the vehicle more quickly in this case. Driving quickly to and from Munich airport, mostly at 160 km/h or more, results in a very low loading coefficient.
But, as I said, it doesn't matter to me - it will also regenerate at 3% and 380km. Of course, in addition to the mileage, the load coefficient is also checked by the control unit as a trigger for regeneration - I know that. I had a single regeneration event in the 5 years and 116,000 km, due to the load factor – just before reaching 380 km. I believe it was around 45%, but I need to check.
But I can't change this 380km cycle anyway, and I don't want to talk about it with anyone at the workshop. No one there has any idea about these internal things, or they don't want to know. It's clear why, isn't it?

Yes.

"But if it only has 3% battery after 380 km, it will finish regenerating faster, meaning it injects less fuel, which leads to less diesel in the oil."

"Do you always have to use more than 40% biodiesel after 200 km (like I probably often do)? He often adds a lot of diesel for combustion, which then ends up largely in the oil."

Therefore, the frequency of the R-phase is not crucial, but rather the intensity (i.e., how long it persists to allow for regeneration).

m;

dieselmartin wrote:

Yes, "But if it only has 3% battery after 380 km, it will finish regenerating faster, meaning it injects less fuel, which leads to less diesel in the oil." "Do you always have to use more than 40% biodiesel after 200 km (like I probably often do)? He often adds a lot of diesel for combustion, which then ends up largely in the oil." Therefore, the frequency of the R-phase is not crucial, but rather the intensity (i.e., how long it persists to allow for regeneration). m;

Okay, I've also closely monitored the "free charging" phase many times. I usually drive it down the highway, and typically, with my usual very moderate driving style – meaning around 100-120 km/h – the regeneration process usually takes 12 kilometers. However, with a very low load factor (around 3-8%), it probably takes 8-9 kilometers. The difference isn't that huge (at least, in my personal experience).
And as I said, in 19 out of 20 cases, I end up sliding down the highway.

Quote:

In my case, the regeneration process usually takes 12 km. However, with a very low load coefficient (approximately 3-8%), it will certainly take 8-9 km. The difference isn't that huge (mind you, this is based on my personal experience).

That would at least be a 30% shorter regeneration time... and with that driving style, there might be an increase in oil consumption.

I think your problem can only be reduced by modifying the software.

When you detect the start of regeneration, try to maintain a high exhaust gas temperature, as this should minimize the amount of post-injection required.