Two Stroke Oil in Diesel Fuel

[Rommel]

I know this is a well known subject and I have been adding this in my Landrover Defender with very good results.

HOWEVER can anyone say if this is O.K. to do on a 2.0 Audi TDi with a DPF??? Some say its good for the DPF and stops it clogging as the two stroke burns more thoroughly and produces less soot.

Others say its not good with a DPF equipped vehicle??

Comments please.

Thanks.
Tony.

 

[cuke2u]

Doubtful it does anything but harm...

 

[Rommel]

My Defender definately runs quieter, smoother, and emmisions are reduced by 50 % on the last M.O.T improved MPG pulls more at lower revs and the added lubrication to the fuel system and injectors after the introduction of low Sulphur Deisel.

but then thats a Defender engine not a Audi which is why I am asking the question.

 

[cuke2u]

I would be concerned about, if it has one, the paper fuel filter, the seals, the pump, the injectors etc. Does the manual recommend any additives?

 

[CHEZ]

I would be more concerned about the 2 stroke oil turning the fuel red imo!
Try explaining that one 😉

 

[Rommel]

I use GREEN mineral oil as the RED synthetic does not mix with Diesel fuel like water does not mix with oil so no probs there!. Besides HMRC and VOSA
have chemical testing kits that can identify what is in the tank

 

[Rommel]

I would be concerned about, if it has one, the paper fuel filter, the seals, the pump, the injectors etc. Does the manual recommend any additives?

Well there's a paper fuel filter and rubber seals and injectors on my Defender and I have had no probs.

 

[yendall24]

i have been using 2 stroke in my a4 1.9 tdi b6 for the last 2 years it certainly makes the engine quieter as regards the dpf 2 stroke makes the diesel burn more cleanly a more complete combustion and therefore produces less smoke and particles less smoke and particles can only be good for the dpf . it is meant to be used in tiny doses 300ml to 70 litres so as regards colouring the diesel no it does not as regards the filter and seals 2 stroke is an oil and so is diesel . 2 stroke replaces the lubrication lost in low sulphur diesel so it is good for the pump and injectors . i have found no downside to using it except the cost my car runs smoother sounds better and is more responsive due to better combustion and as flew through the last 2 mots with 2 stroke in mot due this week and suspect it will fly through that also

 

[Rommel]

i have been using 2 stroke in my a4 1.9 tdi b6 for the last 2 years it certainly makes the engine quieter as regards the dpf 2 stroke makes the diesel burn more cleanly a more complete combustion and therefore produces less smoke and particles less smoke and particles can only be good for the dpf . it is meant to be used in tiny doses 300ml to 70 litres so as regards colouring the diesel no it does not as regards the filter and seals 2 stroke is an oil and so is diesel . 2 stroke replaces the lubrication lost in low sulphur diesel so it is good for the pump and injectors . i have found no downside to using it except the cost my car runs smoother sounds better and is more responsive due to better combustion and as flew through the last 2 mots with 2 stroke in mot due this week and suspect it will fly through that also

Many thanks.

for your positive and helpful reply.

Regards.

Tony.

 

[Flibble]

Doubtful it does anything but harm...

Doubtful it does anything at all. Diesel and 2 stroke oil aren't that different really and diesels will run on cooking oil and the like as well. You're just adding oil to other oil when it comes down to it. It's possible two-stroke oil raises the cetane number of the fuel a bit and hence you get better running.

 

[Flibble]

A quick google suggests 2-stroke reduces the cetane rating of the fuel in fact, which accounts for the smoother running - lower cetane means a slower ignition which is quieter.

 

[cuke2u]

Although contrary to that it is a suggested that a lower cetane is bad Cetane Number Improver Cetane Number Improver Diesel Cetane Number - Diesel Fuel Cetane Rating - What is Cetane AutoSpeed - Diesel cetane ratings All these articles suggest it is unwise to reduce the cetane as it is similar to reducing the octane in petrol...

 

[yendall24]

hi all . i took my car for its mot today as mentioned in an earlier post on this topic the car is an audi a4 2004 1.9 tdi avant with exactly 138882 miles on the clock at the time of the mot . the car passed with no advisories here is the opacity test results acceleration 1/ 1.60 acceleration 2/ 0.81 acceleration 3/ 0.70 acceleration 4/ 0.77 opacity mean value 0.75 . this is after using 2 stroke in my diesel for the past 2 years i am pleased with that so will be carrying on using it 300ml to 70 litres

 

[steeve]

Your choice, but surely if it was a positive wouldn't the manufacturers recommend it or the fuel suppliers might add it?

 

[yendall24]

why should the manufacturer or the fuel companies recommend it they think standard low sulphur diesel is fine . i am just putting the lubrication back they have taken out and also they do not have to pick up the bill for worn pumps and injectors due to reduced lubrication all i know is my car is running great on it . its just a personal choice mercedes have done a load of research on it due to premature fuel pump wear google it it is interesting reading and the reason i started using it

 

[cuke2u]

Having done more 'googling' about this subject I believe it falls into the same train of though as using premium, or 98 octane, fuel in your petrol engine, although with different effects upon the engine. There is also a lack out there of anything that is based upon scientific research, just that some 'feel' their engines run better. So perhaps it is up to the individual but I thought, talking lubrication here, that some was added to sulphur free diesel anyway to compensate.

I suppose though if adding 2-stoke oil to your diesel was that good the forums would be alive with it...

 

[Rommel]

Due to the pollution control measures of the EC diesel-oil is nearly sulphur free and contains up to 5% of bio-diesel. Sulphur has the property to grease the high pressure injection pump and the injectors. Without sulphur, the reduced greasing property of the new diesel has already shown negative impacts on the long-term stability of the injectors and the high pressure pump. The pump manufacturers have tried to react by lining the moving parts of the pumps with teflon or other suitable material. However, the long term stability is still not achieved as with the old (sulphor contained) diesel.

The engine-research centre of a well known German car manufacurer has conducted some long term tests of diesel additives to find out whether any one of them will have an impact on the long term reliability of the diesel engine components. This introduction to explain were my information comes from.
The results of this research: any diesel additive of any manufacturer presently on the market is not worth the money!

BUT: 2-stroke oil, which we use in our motor saws, lawn mower or in 2-stroke motor engines has shown to have an extreme positive impact on diesel engines, if such 2-stroke oil is added to the diesel in a homoeophatic dosis of 1:200. In practical terms: 0,300 litre of 2-stroke oil into the 70l diesel tank. The 2-stroke oil will be absorbed by the diesel (emulsion) and grease every moving part of the high pressure pump and the injectors.

Besides this, the 2-stroke oil will keep the diesel engine clean, as it burnes cleaner as the diesel itself.

In other words, the 2-stroke oil has a much lower ash-content as diesel, when burned. This proven fact delays the DPF (diesel particulate (soot) filter) to clogg, and the "burn free" process of the DPF will be much less.
One more information: in Germany we have to present our cars every 2 years to the TUV -Technical Supervision Organisation - who will check, amongs others, the pollution of petrol and diesel engines.
The measured cloud-factor of a diesel engine without use of 2-stroke oil has been 0,95.
The same factor with the use of 2-stroke oil has been 0,47 - reduction of nearly half of the soot particles.
Besides this, the use of 2-stroke oil in the diesel will increase the milage by 3-5%.

 

[cuke2u]

Yes I read that too, it so often quoted in different forums but I can't find an actual link to the tests that Mercedes performed but, if true, I understand it was with older diesel engines that perhaps weren't designed around low sulphur diesel and the tests were conducted with, as far as I understand, low quality eastern European diesel.

However the end of the day it is up to you. You have convinced yourself, as some of those who believe 'premium' fuels in their petrol engines, it is better, when there has been no independent research to support it with present day engines.

 

[Adrian888]

There is a good long section on 2SO as an additive on the A2OC forum with some pretty convincing lab photos. I find 2SO works very well in my A2 but less so in my previous Freelander 2. have yet to try it in the a6 but will shortly do so.