Biodiesel? Was haltet ihr davon? | Posts 16+

Hi,

There is an internal VW study about the correlation between pump failures and biodiesel. Unfortunately, I was only told about it, as the document is supposed to be confidential. The main point is likely that there are no increased accident rates when operating approved vehicles using biodiesel.
In the cases where something did happen, it appears to involve models that were not authorized for use or the use of fuels that were not approved (such as pure vegetable oil or other alternatives).
Let's see, maybe there's a way to get the paper after all .

Regards,

Eike.

eike wrote:

There is an internal VW study about the correlation between pump failures and biodiesel. Unfortunately, I was only told about it, as the paper is supposed to be confidential. The main point is likely that there are no increased accident rates when operating approved vehicles with biodiesel. .

Hi.

"Confidential" for me always means "must not be made public for certain reasons."

And what other reasons can one imagine for this, besides the fact that, in the field of bio, "unfortunately" many pumps fail?

Hello,

There is an internal VAG working instruction regarding issues with biodiesel.
"If a customer complaint arises, the diesel filter and the fuel injection pump (in PD engines, the tandem pump) should be flushed with regular diesel fuel. If the engine then runs smoothly, further repair attempts should be avoided." "The costs will not be covered by VAG."

Since VAG is comparing the results not with biodiesel that meets the standards, but with regular diesel fuel, it's easy to shift the blame onto a supposedly inferior fuel that doesn't meet the standards.

And here's what Bosch has to say about it:

Fuels approved by RB for use:

Diesel fuel according to EN 590 (2000).
Sulfur-free diesel fuel (sulfur content < 10 ppm).
according to EN 590

Diesel fuel according to EN 590 with up to 5 Vol.% FAME 1)
according to DRAFT prEN 14214
Diesel fuel with additives, produced by mineral oil companies.
acknowledged, provided that EN 590 is complied with.
Diesel fuel according to JIS K 2204: 1 and 3, provided it has sufficient lubricity.
According to EN 590 (provided successful testing).
Diesel fuel according to ASTM D 975: 1D and 2D 3), if lubrication is required.
Ability according to EN 590 (provided successful testing).
1) Fatty acid methyl esters (biodiesel)
2) Japanese standard
3) US standard

Fuels that RB does not generally approve of.
to receive deployment. Individual approval, possibly with dimensions.
Package available after successful testing:

Diesel fuel with poor lubricity and an HFRR value greater than 460 µm.
<650> 5 Vol.% *Heating oil (e.g., BS 2869) *
* including additives for diesel fuel.

CU Gremlin.

So, my experiences with biodiesel are quite varied, and I wouldn't reject it outright.

I owned a Bora 115PS PD (AJM) from 1999 to 2001, and I also had it chip-tuned.

During that time, I drove both regular diesel and biodiesel, both with and without a performance chip.

I repeatedly noticed that the differences between 'normal' diesel and biodiesel aren't that big (except for the smell ) if you actually get a good quality product!
Actually, there are gas stations that sell what's labeled as 'PME' (presumably a type of fuel additive), and some of it is of such good quality that you can hardly tell the difference.

For example, there's a Mundorf gas station here in Troisdorf/Spich, and I would strongly advise against buying PME (or any other fuel) there; although the price difference is currently almost 20 cents (82/63).
They're selling the very last of the salad oil; it also smells absolutely disgusting.

Near Neumünster, there's a truck stop where the quality of the biodiesel is, in my opinion, beyond reproach. The performance, fuel consumption, and starting behavior are remarkably similar to genuine diesel, and it's also about 20 cents cheaper.

In my opinion, there are still some quality differences, so it's important to pay attention to what you're buying.

Generally, there were no problems with either of the two cars after 120,000 kilometers. (Models 1Z and AJM).

With biodiesel AND additives, the engine ran noticeably quieter and smoother than with regular diesel.

Stefan.

So, my experiences with biodiesel are quite varied, and I wouldn't reject it outright.

I owned a Bora 115PS PD (AJM) from 1999 to 2001, and I also had it chip-tuned.

During that time, I drove both regular diesel and biodiesel, both with and without a performance chip.

I repeatedly noticed that the differences between 'normal' diesel and biodiesel aren't that big (except for the smell ) if you actually get a good quality product!
Actually, there are gas stations that sell what's labeled as 'PME' (presumably a type of fuel additive), and some of it is of such good quality that you can hardly tell the difference.

For example, there's a Mundorf gas station here in Troisdorf/Spich, and I would strongly advise against buying PME (or any other fuel) there; although the price difference is currently almost 20 cents (82/63).
They're selling the very last of the salad oil; it also smells absolutely disgusting.

Near Neumünster, there's a truck stop where the quality of the biodiesel is, in my opinion, beyond reproach. The performance, fuel consumption, and starting behavior are remarkably similar to genuine diesel, and it's also about 20 cents cheaper.

In my opinion, there are still some quality differences, so it's important to pay attention to what you're buying.

Generally, there were no problems with either of the two cars after 120,000 kilometers. (Models 1Z and AJM).

With biodiesel AND additives, the engine ran noticeably quieter and smoother than with regular diesel.

Stefan.

I've often had the impression that the car feels more responsive and has better acceleration when running on biodiesel, sometimes even noticeably so! 'However, it also consumed a bit more fuel, even according to the MFA (Multi-Function Display), and I practically always drive the exact same route, so I consistently have the same average fuel consumption.'
However, as I mentioned in another thread, in my opinion, biodiesel is more harmful to the environment when you take into account its production and the more toxic emissions it produces. However, it is CO2 neutral – it only burns what was previously extracted from the atmosphere as carbon, which is obviously a clear advantage. So, like most things, the answer is a clear 'maybe.'

@Alois: I see it as a positive thing that the deposits are being dissolved, but just remember to replace the filter next time... Also, this applies to VERY old vehicles; with today's diesel, deposits shouldn't form. If you do have deposits, try switching gas stations .

VW also stipulates that for vehicles operated with RME (biodiesel), the fuel filter must be checked and drained during every oil change/inspection.

My first car was a Golf 1 diesel with 54 horsepower, manufactured in 1976, if I remember correctly. I drove it for a very long time on biodiesel. When I bought the car, it had approximately 170,000 kilometers on the odometer (if the mileage was original), and it gave up the ghost at around 290,000 kilometers... but otherwise, it ran like a '1,' if you overlook the occasional starting difficulties in winter, and it only used 5-6 liters of diesel .

Biodiesel? NO THANK YOU!!
My comment on that!
It's good for the eyes, but not for the wallet.
My own experience confirms this: The diesel filter might be clogged, the ESP (Electronic Stability Program) might fail at some point, or, as in my case, the inlet line might be blocked.
It's really great when it happens unexpectedly and you can't continue driving...

Don't give "biodiesel" a chance!


Best regards: Marko

Hello Marko,

It would be interesting to know what kind of car you drive (make, model, year, etc.). Does it have a biodiesel approval from the manufacturer (according to the owner's manual)? How many kilometers had it been driven on diesel before the first biodiesel fill-up? After how many kilometers with biodiesel did the filter become clogged? And when was the last time it was changed before the blockage occurred?

I suspect that the real culprit is mineral oil diesel. It leaves a lot of residue in the fuel system. While it might not be the most pleasant thing, the fact that it's mobilized by the biodiesel is arguably a cleansing process.

Here's the translation:

'My experience with a G3 TDI 66kw: Initially, it ran on regular diesel for only 18,000 km. Then, I switched to biodiesel. Around 50,000 km, I started noticing signs of clogging in the fuel filter (the car began to lose power on the highway at full throttle after a while). The filter was replaced. After that, I continued using biodiesel. The second filter was still clear after another 70,000 km. I drove the car until 160,000 km without any problems. Then, I got a new one because the leasing contract had expired.' I've been driving the G4 for 43,000 km now without any problems using biodiesel.
I still believe that...

Regards,

Eike.

HI!

Volkswagen Passat B4, 2.5 TDI (AAT), manufactured in 1996.
Don't worry, it's approved for juice.
Starting in September 1995, all "6" models were switched to using juice (presumably referring to a type of fuel or coolant).
I've had the filter seal leak three times so far, over a distance of 80,000 kilometers.
But, as I said, this time it wasn't the filter, but the pipe.
Well, you learn from your mistakes.
I will definitely make sure not to buy gas from that station again!

Best regards: Marko