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

[brad]

It's about 5km of urban & 40km on the motorway. But it's Sydney traffic, so if one little thing goes wrong it all turns to manure.

I'm talking journeys that appear to be exactly the same - not the ones that are FUBAR.

You be the judge
Carwar Ave to Parkside Cres - Google Maps

[JB's Dub]

Im just trying to work out mixing ratios. I'm hoping to make sense of it before I take the plunge! PD injection, 200:1 ok?

[brad]

Im just trying to work out mixing ratios. I'm hoping to make sense of it before I take the plunge! PD injection, 200:1 ok?

yep 200:1. so for 40L fuel add 200ml of 2SO.

Personally, I'd just add 200ml whether it be 40L or 50L fuel

[CardinalSin]

Im just trying to work out mixing ratios. I'm hoping to make sense of it before I take the plunge! PD injection, 200:1 ok?

First time add enough for the tank capacity and fill it right up. 60L tank = 300ml
Then, as Brad said, 1:200 and it doesn't need to be clinical.
JASO FC mineral. If there's a choice get the one with the lowest ash content.

Well done for giving it a go after all the usual negative posts.

[JB's Dub]

Ive got an old Patrol and the Passat. Ive been reading about it on a 4WD forum and was not convinced. Now after reading this, I think its worth a go, for both cars!

[Amalgam]

Ive got an old Patrol and the Passat. Ive been reading about it on a 4WD forum and was not convinced. Now after reading this, I think its worth a go, for both cars!

Because of the age of your vehicles and the assumed milage, would you be so kind as to report back your results after 1 and 2 tankful.

Although I expect a reduction in diesel clatter and increase in smoothness, both are highly subjective and prone to operator bias. I would be very keen on your fuel consumption reading both before and after to judge if mine were an aberration.

Thanks

[JB's Dub]

Yeah, No problems. The Passat is driven by my wife which does not do many kays while doing food shopping and running kids around, and as we live in the Dandenongs, it all up and down hill, so consumption probably wont be noticed as its almost impossible to get an average! But certainly Ill be keeping a close eye (or ear) on noise and 'feel'.

[kaanage]

The thing is that Biodiesel is chemically quite different from mineral diesel - sure they are both long chain hydrocarbons, but bio has a lot of OH group's and various aromatics that arent present in mineral diesel. Bio is a fuel made of methyl esters - its edible, for crying out loud (not that it tastes any good!).

And yet, the net effect is not a night and day difference in engine performance - its significant, but its not miraculous.

Then theres the aforementioned theory of a healthy improvement in fuel economy with just the addition of a few percent 2SO to regular diesel...

All this to say nothing really.... just wanting to explain my, lets say, healthy scepticism.

Yes, in the case of biodiesel vs normal diesel, "Oils ain't oils" as the old ad went

I think a large part of the beneficial effects of straight biodiesel is due to it being far more homogeneous since there are only a limited number of methyl esters that result from the extraction from the raw biological oil stock. The burn characteristics of these esters will be similar so you get a well controlled burn.

Normal diesel, on the other hand, being merely a distillation fraction (hence the alternative name distillate) that meets the cetane, vapor pressure and viscosity requirements (and which varies according the temperature zone it is intended for) can consist of a vast multitude of hydrocarbons molecules with a large variation in the burn characteristics.

I have a gut feeling (OK, this is speculation but I'll put it up there) that all diesel additives, including 2 stroke oil, introduce a chemical blend that has very specific makeup with one of the major requirements being that they burn cleanly and ignite at a designated temperature. This would mean that the ignition and consequent burn of the fuel droplets sprayed into the combustion chamber by the injectors would be far more predictable as the additive molecules would act as an ignition point for the rest of the droplet and the prevention of late ignition droplets results in more complete (and hence cleaner) combustion and smoother running.

The cleaning properties of the additives wouldn't need high concentrations either if you think about how much detergent you add to your dishwashing basin.

The difference I see with 2 stroke oil vs other additives is that although it might not have been specifically concocted for diesel usage, it serendipitously has the ignition point in the desired range for diesel running (whatever the reason) and we use far more of it than specific additives since it is so cheap plus that it is primarily a lubricant. The makes the cleaning effect better, even if the combustion effects end up the same making 2 stroke oil, overall, a very good additive

I hope this speculative thinking doesn't fall too far outside the guidelines of the thread since I feel it is quite logical given the know characteristics of normal diesel and the requirements for 2 stroke oil.

[gldgti]

Sounds plausible, for sure

[Ryeman]

<yetiownersclub.co.uk> has v interesting DPF/2SO discussion in the skoda yeti owners - technical section by 'chocki'
with lots of technical links.
It's a current 2015 discussion and for those 'into' 2SO worth going to, I'd think.
maybe someone can do a link ?.