hello just wondering if anyone has tried putting two stroke oil in with diesel fuel to replace the sulphur and boost the cleaning process? does it do any damage or just good?

The effect of adding two stroke oil will in no way decrease the sulphur content of the fuel. It will however increase the temperature of combustion because of the fact that the fuel air ratio is effected to the extent that there will be more air than readily combustible fuel. You will also leave a increse in your smoke emmissions and could possibly over oil the top end with the result that combustion chamber and valves could become coked.

Leave the technical side of the fuel to the fuel company. That is providing you are buying a good brand. If you are not. Change.

I spent many years as a fuel technical representative with one of the majors.

Dont dismiss it out of hand, personally if you do a net trawl most posts are positive but watch out for the correct grade

Some light bedtime reading below

http://www.freel2.com/forum/topic878.html

Adding a drop of two strike does work well and quietens most diesels of the clatter. Adding 200 ml to a tankful of diesel has noticeable effects. Its probably illegal though because there is no fuel duty paid on the two stroke as such, but you will only be depriving the chancellor of a few pence.

A member on here named Basil had a long thread in the Fabia section about this.

He added 2 stroke in his VRS 1.9tdi and had good results as did many others. IIRC it was 250ml to a tank full of diesel but can't be sure as the thread is very old now and I can't find it.

I've never tried 2 stroke in a PD but I did on my old Xsara HDi common rail with good results. Over the years I tried various additives such as Millers, Forte etc and premium diesel in that car without any of them making the slightest difference as far as I could tell.

Sticking a litre of 2 stroke oil in with a full tank of derv did however make the engine run noticeably smoother, start easier, and, surprisingly, stopped the exhaust from smoking under heavy acceleration. All of these effects wore off as soon as I refilled the tank with pure derv however.

Bad idea it will affect the precision of the finely tuned injector spray.

Slaps Head - I am constantly amazed and not a little confused at the number fo people who want to add snake-oil to their fuel tanks!

Is it really worth the risk?

Is your car really suffering that much degradation?

Is that a pig with wings?

Slaps Head - I am constantly amazed and not a little confused at the number fo people who want to add snake-oil to their fuel tanks!

Is it really worth the risk?

Is your car really suffering that much degradation?

Is that a pig with wings?

The reason I tried various additives in the HDi was as it had (I think) an intermittently sticking fuel pressure regulator. They were an attempt to free it off without dismantling the pump, which can introduce further dirt no matter how careful you are. None appeared to do any long term good, but then none appeared to do any long term harm either.

One thing that's not mentioned here is that with the PD unit, VAG state that no additives can be used.

VAG say that with all of their diesel engines, as do most manufacturers. Doesn't stop some main dealers trying to sell you fuel additives at service time however...

One thing that's not mentioned here is that with the PD unit, VAG state that no additives can be used.

Mike

I'd agree, sort of.

Apparently Shell use "Shell Efficiency Improver" in their FuelSave flavour, and V-Power "....is designed to continuously clean modern precision fuel injection systems, helping your diesel car achieve its full performance potential."

Surely those would be the use of additives?

According to Page 206 of my '57 Octy owners manual: "You must not use fuel additives, so called "flow improvers" (petrol and similar products) in diesel fuel." The book recommends Din EN 590 fuel. With additives (e.g. what Shell do) does this place the fuel outside of EN590?

What fuel is out there that is "naked" EN590?

I used to see in handbooks "<Manufacturer> recommends the use of <oil company> fuels and oils", which kind of implies that's what the chosen fuel/oil when the engine was being designed. Not seen any of that in the Skoda book. Is there a Skoda recommended oil and fuel?

I do remember that my '51 plate Golf TDi "felt" much happier on BP than anything else.

The effect of adding two stroke oil will in no way decrease the sulphur content of the fuel. It will however increase the temperature of combustion because of the fact that the fuel air ratio is effected to the extent that there will be more air than readily combustible fuel. You will also leave a increse in your smoke emmissions and could possibly over oil the top end with the result that combustion chamber and valves could become coked.

Leave the technical side of the fuel to the fuel company. That is providing you are buying a good brand. If you are not. Change.

I spent many years as a fuel technical representative with one of the majors.

There is always an excess of air in diesel combustion.

The smoke is usually from there not being time for complete combustion at higher RPM.

Are you saying that the two stroke will increase air? I'm assuming that's not what you're saying, but am not quite getting what you're getting at.

Rest of it makes sense, but just not that.

Edited 20 July, 201213 yr by cheezemonkhai

There is always an excess of air in diesel combustion.

The smoke is usually from there not being time for complete combustion at higher RPM.

Are you saying that the two stroke will increase air? I'm assuming that's not what you're saying, but am not quite getting what you're getting at.

Rest of it makes sense, but just not that.

I think he's suggesting that the oil won't be 'readily combustable' fuel and therefore if air : fuel remains the same in total (as requested by the ECU which will think you're running 100% derv) then air : 'burnable fuel' becomes, by definition, a higher air ratio.

Dunno - but as he used to work in the fuel business I would be reluctant to dismiss his advice too quickly........

Yes that is the general idea. If one thinks in terms of a two stroke engine, then a vast number of people think that if the engine is running lean then the answer is to add more oil to the fuel. Wrong! The result is that because the ratio between the fuel and air mix means that there is now more air then the engine runs even leaner. Many two strokes have seized this way. Surprisingly the large fuel companies do know more than a little about fuels and are constantly researching to improve the product. Trust their product. They really do know more than "My mate Joe down the road" If some of the fanciful ideas that have been released on to the market, by way of fuel and lubricant additives, over the years really worked then a major oill company would have used them in order to gain an advanatge over rivals! There are examples of some of the base products in some quite well known aftermarket additives doing much more harm than good. In one case that I recall one base product used in a lubricant additive is used by majors in lubricants but never, never in lubricant that is for use in engines however fuelled.

Isn't the key difference here that we're talking about a compression ignition engine rather a spark ignition engine?

Whilst a spark ingition two stroke petrol engine will not readily burn two stroke oil as fuel (which is really the point of adding it on those, as residual lubrication), a compression ignition diesel engine will. So whereas adding two stroke oil to a spark ignition petrol engine weakens the fuel to air ratio, adding two stroke oil to diesel makes no difference to the fuel to air ratio at all as the compression ignition engine readily burns the two stroke oil as fuel.

Surprisingly the large fuel companies do know more than a little about fuels and are constantly researching to improve the product. Trust their product. They really do know more than "My mate Joe down the road" If some of the fanciful ideas that have been released on to the market, by way of fuel and lubricant additives, over the years really worked then a major oill company would have used them in order to gain an advanatge over rivals!

A fuel that is twice as efficient will only sell half as much. You won't be able to double the price to compensate either. So, no oil company will want to gain an advantage that their rivals don't have, as it would ultimately cost more. That's why there's no "major advancements", only little ones.

It's all about money, not efficiency or the environment.

well i put some mineral two stroke in and ive done 100+ miles and its running alot smoother and more instant power bonus!!

well i put some mineral two stroke in and ive done 100+ miles and its running alot smoother and more instant power bonus!!

I ate brown rice at lunch today and I'm sure I can feel the reduction in cholesterol and sodium. Damn I'm getting nothing but nutrients with every spoonful

Doesnt matter what you say on here it always falls on deaf ears, good luck with that.

People will be talking about sticking teflon in their engines next ......... did somebody say Slick 50?!!!

People will be talking about sticking teflon in their engines next ......... did somebody say Slick 50?!!!

Only if you like a clogged oil filter and an open bypass valve.

People will be talking about sticking teflon in their engines next ......... did somebody say Slick 50?!!!

Why use that when used cooking oil is free! Lol

I used to work in the fuel supply industry.

Check your change, that's all I'm saying

Paraffin !

Paraffin !

Thanks, but I've had enough to drink today.