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.

That's exactly what I was just thinking!

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

HI,

How will diesel engines behave in the future, especially considering the shift towards 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 really enjoyed "max" amount of coffee.
I drove 1300 km west and arrived with just a tiny bit of fuel left... and I still have the return journey ahead of me?

m;

Something might happen starting around an oil temperature of 140°C.

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

But the post seems to have resolved itself, or has it?

After I had first resealed the PD elements, and after...
After approximately 3500 km, I noticed that the engine oil level was still 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 for your review.
5.42% diesel fuel detected in the engine oil after 7000 km, which isn't exactly a good sign.
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."
In this way, I was able to stop the negative trend and move towards a...
Lower a reasonably sensible level.
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 (I didn't have an analysis done during the previous oil change).
Over 10% diesel content.
But, as mentioned above, I don't care whether CASTROL and VW believe that this is 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 of 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 an eye on it for now.

m;

Most people don't even realize what's going on.
My friend 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 refuses to listen to the possibility that this might be a fallacy, 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'm really envious of him.

Blessed are the clueless.

But honestly, many technical issues are much simpler if you don't worry too much about them. Of course, if the machine then breaks down, you can always 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 the 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 particulate emissions have been?

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

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

I think my motor is regenerating too often.
Driving style, whatever.
Sure, I understand that it would be better for fuel dilution in the engine oil if I drove more aggressively.
My engine always regenerates after 380 km. Previously, I always had my laptop nearby, but nowadays I set the trip odometer so that I can shift the regeneration phase onto the highway, which almost always works.
And in that 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. Traveling rapidly to and from Munich Airport, mostly at 160 km/h or more, is achieved with 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 only had one regeneration in the 5 years and 116,000km due to the load coefficient - just before reaching the 380km mark, I think it was around 45% if I remember correctly - I should check."
But I can't change this 380km service interval anyway, and I don't need to talk to anyone about it at the workshop. No one there has any idea about these internal things, or wants to know about them. It's understandable why.

Yes.

"But if it only has 3% remaining after 380 km, it will reach the end of the regeneration process faster, meaning it will inject less fuel, which leads to less diesel in the oil."

"Do you always manage to achieve 40% fuel efficiency after 200 km (like I probably do most of the time)? He often injects a lot of diesel to help it burn properly, which then ends up largely in the oil."

Therefore, the frequency of the R-phase is not the decisive factor, 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 its charge faster, meaning it will inject less fuel, which leads to less diesel in the oil." "Do you always manage to achieve 40% fuel efficiency after 200 km (like I probably do most of the time)? He often injects a lot of diesel to help it burn properly, which then ends up largely in the oil." Therefore, the frequency of the R-phase is not the decisive factor, but rather the intensity (i.e., how long it persists to allow for regeneration). m;

"Well, I've also closely followed the pre-heating phase many times already. I usually drive it down the highway - and, as a rule, with my usual very moderate driving style, meaning around 100-120 km/h. In that case, the regeneration 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 (mind you, this is based on my personal experience)."
And as I said, in 19 out of 20 cases, I end up sliding down the ramp onto the highway.

Quote:

In my case, the regeneration process usually takes 12 km. However, with a very low load coefficient (approximately 3-8%), it probably takes 8-9 km. The difference isn't that huge (noted, 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.