Adding 2 stroke oil to fuel - Interesting reading!!

[CardinalSin]

Just so long as it doesn't start to sound like a Trabant

Just read your fuelly and 6.7L/100km for the 1.6TD Caddy. You must have heavy traffic in your neck of the woods when it's rated at 5.7L/100km. I got the rated 6.7L/100km for my 2.0TD and 2SO oil lowered that to 6.3L/100km by calculation at the pump.
So you could expect the same saving from yours, after all the carbon gets cleaned out and also have it quieter, cleaner and smoother.
The only thing is, it doesn't say 'Diesel fuel additive' on the container but none of those branded diesel fuel additives have ever made any difference when I have tried them.

[gldgti]

I will also be interesting to see of the Audi starts blowing smoke for a day or so

Why would this happen?

[CardinalSin]

Why would this happen?

Because it should clear out the deposits. Several people have reported that older engines smoked a bit on the over-run but it cleared after a few days and they could feel the improvement.

[CardinalSin]

I've a rule in my business - "use always as per instructions" I think it's valid in almost everything in people's life.

I can see where you're coming from now and can understand your point of view.

I was trained in both aircraft and automotive, engines mainly and spent a fair bit of time diagnosing and solving problems. I always enjoyed the problem solving and creative engineering. Prior to that I hated being told to do something 'because I said so' would throw instructions in the bin to do it the hard way and still do. Sometimes I have to fish them out when i'm stumped!

So you accept the instructions as gospel while I always look for a better way and often find them. Our brains are wired differently.

[gldgti]

Because it should clear out the deposits. Several people have reported that older engines smoked a bit on the over-run but it cleared after a few days and they could feel the improvement.

That doesn't make any sense really. The mass of deposited carbon in the combustion chamber is very small. If it all got cleaned out at once, which it certainly won't, it would amount to nothing more than a quick puff of muck.
I've rebuilt enough diesel engines to know what carbon buildup looks like and how and where it builds up.
The only possible reason I could conceive of for temporary smokyness brought on by some kind of fuel related cleaning, would be that between carbon buildup being baked on and flaking off, it might foul the spray pattern of the injectors... But even that seems to be a stretch.
As it happens, my Audi only ever really smokes on startup and I note that today it didn't seem to really.

[CardinalSin]

That doesn't make any sense really. The mass of deposited carbon in the combustion chamber is very small. If it all got cleaned out at once, which it certainly won't, it would amount to nothing more than a quick puff of muck.
I've rebuilt enough diesel engines to know what carbon buildup looks like and how and where it builds up.
The only possible reason I could conceive of for temporary smokyness brought on by some kind of fuel related cleaning, would be that between carbon buildup being baked on and flaking off, it might foul the spray pattern of the injectors... But even that seems to be a stretch.
As it happens, my Audi only ever really smokes on startup and I note that today it didn't seem to really.

I agree when you put it that way but i've seen a few posts that mention some blue smoke for a few days when they lift off but it always stops. Maybe it's to do with the rings in the piston grooves and/or the valve guides. Perhaps better cylinder sealing with the 2SO and therefore higher suction on the over-run pulling some oil through until the crud in the ring grooves is cleaned out and the rings can achieve full range again?
The other aspect is reducing smoking, which you noticed on start up and with a very light mix compared to the usual 1:200.

[Greg Roles]

DPF's primarily clog because of oil ash. I'd want to run additives that have zero ash personally.

DPF approved engine oils have amazingly low oil ash levels compared to the norm.

Still small potatoes compared to the amount of oil blowby stock engines digest.

[kaanage]

Which is why for DPF equipped cars, you should only use JASO FC or TCW-3 spec 2 stroke oil while those without can also use JASO FB.

Clearing carbon deposits from the injector nozzles is the other cause for smoke with cars that have been running on "normal" diesel for a long time when they first run with 2 stroke oil. I thought biodiesel users found the same thing.

[Mysticality]

Yours at 15,000km still clean tail pipes indicate that, YES the car's Diesel Particle Filter trap does it's job trapping the unburned oil and extra soot particles.

My fingers, after wiping the inside of the mid section of the 60,000km-old exhaust pipe of the Octy vRS TDI. (When 3" catback was going in)
Note: Some of it could also be from the grinder the exhaust shop guys used


The pipes in question
(Next to some of the new stuff)

[CardinalSin]

Good job you changed it when you did with all that carbon in there!

Just finished reading about your car in Auskoda. With a stage 2 tune, intake mods and DPF delete the EGT might have helped clean that pipe out. I hope it's out of warranty or they'll be getting their knickers in a twist in here.

[gldgti]

naw he still had a dpf then

[CardinalSin]

If the DPF needs replacing after the warranty runs out it seems a no brainer to give it the flick unless it's something like $300, which I know it wont be. Getting the ECU modified is probably the hard part, especially on Skodas with the locked ECU.
That rear muffler looks like it could be deleted to save some weight and back pressure and I bet it would still be quiet. That's something that could be done during warranty with little chance it will hamper any claims.

Sorry, getting off topic.

[Greg Roles]

naw he still had a dpf then

Yeah a DPF deleted car is going to pump out a ton of soot, especially on a power tune. Quite obvious these days.

[CardinalSin]

Yeah a DPF deleted car is going to pump out a ton of soot, especially on a power tune. Quite obvious these days.

Surely their can't be much soot getting through these days, with the injection and combustion so much more efficient?
If there was, the DPF wouldn't be able to cope.
I had an ML Triton with the 2.5CRD, the 100kw/318nm version. There was never a hint of smoke or soot from the exhaust.
I blocked the ERG, had a switch fitted to keep the throttle valve open, modified the exhaust and had the ECU and boost modified on a dyno. It was putting out 131kw/455nm but there was still no hint of smoke or soot from the exhaust and the economy was slightly better than before.
I did religiously add 2SO at 1:200 to help keep it all well lubricated and clean in there.

Forgot to mention it did have a cat but no DPF.

I still have no idea when my 103TDI is doing a regen? What are the symptoms?

[gldgti]

Surely their can't be much soot getting through these days, with the injection and combustion so much more efficient?
If there was, the DPF wouldn't be able to cope.
I had an ML Triton with the 2.5CRD, the 100kw/318nm version. There was never a hint of smoke or soot from the exhaust.
I blocked the ERG, had a switch fitted to keep the throttle valve open, modified the exhaust and had the ECU and boost modified on a dyno. It was putting out 131kw/455nm but there was still no hint of smoke or soot from the exhaust and the economy was slightly better than before.
I did religiously add 2SO at 1:200 to help keep it all well lubricated and clean in there.

Forgot to mention it did have a cat but no DPF.

I still have no idea when my 103TDI is doing a regen? What are the symptoms?

Take it from a few fellas that have cut open DPF casings for whatever reason - DPF equipped engines produce plenty of smoke and the DPF really works.

FWIW, i see plenty of new diesels (non dpf equipped) that smoke plenty too. It might not be obvious to the guy driving, but its there. New ford territory's and Range-rover sport diesels, I'm looking at you