2 stroke oil (2SO) as an additive to diesel fuel

[brad]

Neither can I, I wasn't thinking clearly when I said that.

If the O2 sensor is leaning the mixture out, would that raise or lower the EGT?

Fantastic fuel economy. What made you change from mineral to marine synthetic when that has been the blend that's been widely reported not to use, based on it's combustion properties being less complete than mineral oil and causing problems such as deposits on the injector tips? Someone was using it on a BRZ/86 and noticed increased deposits on the injectors when they pulled them out again as the seals were causing problems. That's just a specific case I can remember but the warning has come from similar cases I would imagine.

I assume a leaner mixture would raise EGTs

The mineral was the old Stihl / Castrol stuff I had sitting on the shelf. When that ran out I bought whatever was available at Supercheap for <$10 (I had a $10 credit note). All they had was TC-3. We shall see.

The type of driving I do has always got me averaging <7L/100 plus I have the official title bestowed on me by Shell of "Australia's Most Economical Driver"

[CardinalSin]

I would also assume it would raise the EGT but apart from one case, all the others have reported it lowers the EGT.
If we eliminate that we are left with more complete combustion, which would explain the low soot and other emission levels along with the lower EGT's.

I bought that oil from SC too but it's waiting to pamper the chainsaw now, after I decided not to use it. The great price was too much to resist, I remember it well!

I'm impressed by the title, well done!
I enjoy averaging lower than the official figure from my cars too and the brakes last a long time when you avoid using them.

[brad]

I would also assume it would raise the EGT but apart from one case, all the others have reported it lowers the EGT.
If we eliminate that we are left with more complete combustion, which would explain the low soot and other emission levels along with the lower EGT's.

I bought that oil from SC too but it's waiting to pamper the chainsaw now, after I decided not to use it. The great price was too much to resist, I remember it well!

I'm impressed by the title, well done!
I enjoy averaging lower than the official figure from my cars too and the brakes last a long time when you avoid using them.

As I don't have an EGT sensor I wouldn't have a clue.

The title was nice but the $5k cheque was better.

[CardinalSin]

As I don't have an EGT sensor I wouldn't have a clue.

The title was nice but the $5k cheque was better.

A fair number of diesel owners have them, especially if they tow or up the power. When my Triton 2.5CRD was modified for a while, the intercooler temp would go through the roof when I stomped on it. I hate to think what the EGT was? That had 2SO from 3,000km too.

I can imagine how hard everyone tried with that carrot for the taking. It must have been difficult for them when they had to congratulate you, spewing at the same time.

[CardinalSin]

Here's an interesting post on reduced sound levels after adding 2SO.

As you might have noticed, i'm halfway though the posts. One point that comes up on a regular basis is the reduction or elimination of smoke from the exhaust, such as "used to see smoke in the headlights behind while accelerating at night, now there's none". Also "how much cleaner the back of the vehicle is since using 2SO". Not exact quotes but the gist of the comments.
All of which confirm the reduction of soot levels in those cases and thus the evidence that the DPF will have less particles deposited and therefore a longer life.

"Well bugger me sideways I wouldn't have believed it if I didn't see it with my own eyes.

I've a 79 Series ute with a 1HD-FTE motor. I'd read all the things people where saying about the things the 2-stroke oil does, I tried it in the Prado and all good. So now I've got the 79series I thought I'd try it in that. But.....I tried to be a little more scientific about it, so I grabbed the sound level meter from work and took some readings. This is what I found.

Before addition of 2-stroke oil to fuel, with the sound meter resting on the passenger seat engine at operating temperature, A/C off and engine at idle, with the microphone facing towards the front, a maximum sound pressure level of 74.1dB was recorded.
After the addition of Castrol 2T to the fuel load at a ratio of 1:200 and sufficient time and agitation for the fuel load to mix with the same operating conditions a maximum sound power level of 70.6dB was recorded.

I only measured the in cab noise because that's the only one that's relevant to the passengers.

I was absolutely flabbergasted. 3.5dB lower may not sound like a lot, but I believe and I may be wrong and feel free to correct me, a decrease in 3dB means its half the amount of power. Which is different to sounding half as loud.

...hang on I have to go listen to it again.....

Doesn't sound half as loud, but anyhow its a decrease of 3.5dB so it definitely has a measurable difference in the mechanical noise from the engine.

Just thought you guys would like to know that. "

View topic - Interesting thread about 2 stroke oil in diesel fuel | Australian 4WD Action

[Greg Roles]

As far as EGTs go, for a gasser, leaner is hotter, for a diesel, leaner is cooler. You need fuel to raise EGTs in an oiler.

[brad]

As far as EGTs go, for a gasser, leaner is hotter, for a diesel, leaner is cooler. You need fuel to raise EGTs in an oiler.

Thanks Greg

As you may have noticed, I'm a real wiz with diesels

[brad]

I can imagine how hard everyone tried with that carrot for the taking. It must have been difficult for them when they had to congratulate you, spewing at the same time.

Actually, some of them didn't give a toss. We were all driving MKV Golf 1.6 Autos on ULP. The routewas a 200km loop from Rose Hill up into the Blue Mountains & back.

I was driving with Darryl Eastlake and an observer (about 260kg of passengers). Daryll did 2/3rds of the driving because he couldn't read a map for love nor money.

His wife was getting cancer treatment that day & he wanted to be there but had committed to the drive so he was getting "paid" a donation to his favourite charity, The Cancer Council if we won. He said to me when we started "I'm not here to waste a day for nothing. We're here to win for my charity." So we gave it a red hot go & used all the tricks we knew and got 3.68L/100km. Next best was 4.6L/100km and the other 4 cars were over 6L/100km.

Happy days!

[CardinalSin]

As far as EGTs go, for a gasser, leaner is hotter, for a diesel, leaner is cooler. You need fuel to raise EGTs in an oiler.

Leaner is a possibility then. People have reported more power but few, if any have mentioned less power. I would have thought leaning the mixture wouldn't increase the power unless they are all running too rich which doesn't make much sense, especially in the search for lower emissions.
More complete combustion makes more sense when you look at all of the results.

[CardinalSin]

3.68L/100km is insane driving in that region!
We're way off topic but if you ever start a thread on driving for economy or post to an existing one, let me know because I would be very interested to learn more.
Great story!