XC90 D5 adding 2 Stroke Oil to Fuel

[Chunk11]

Thanks Zebster that just confuses me even more as it obviously says that it makes no difference and that the zinc can ruin your injectors!

Tempted to just give it a go...

[mopedmick]

May as well try a bit of snake oil or a sprinkle of fairy dust whilst you are at it, diesels are designed to run on, oh let me think, DIESEL, start adding other things to modern common rail diesel at your peril .........

[Zebster]

Originally Posted by mopedmick

May as well try a bit of snake oil or a sprinkle of fairy dust whilst you are at it, diesels are designed to run on, oh let me think, DIESEL, start adding other things to modern common rail diesel at your peril .........

That's pretty much what I thought a few years back while reading similar glowing testimonials on a Honda forum when I previously owned a high mileage 2005 diesel Accord. However I nevertheless began adding 2T at the recommended 1:200 ratio for an extended trial (until I'd completely used the whole 1L bottle of 2T)... I have to say that I personally noticed no benefit whatsoever in economy, smoothness nor general engine noise while adding 2T. Eventually someone there added that link which I've reposted in this thread, strongly suggesting that in a controlled trial there was no observable benefit and that injector damage from zinc build-up was a likely outcome.

[cheshired5]

Originally Posted by Chunk11

it obviously says that it makes no difference and that the zinc can ruin your injectors!

That report extrapolates a theory but doesn't follow it through with practical tests over tens of thousands of miles.

I've put at least half a million miles onto injectors with 2 stroke in the diesel and I have diagnostics to monitor the performance of my fuel system which shows no negative effects.
That's where my opinion comes from and many others have done similar so when exactly are our injectors going to be ruined?

[Zebster]

Originally Posted by cheshired5

That report extrapolates a theory but doesn't follow it through with practical tests over tens of thousands of miles.

I've put at least half a million miles onto injectors with 2 stroke in the diesel and I have diagnostics to monitor the performance of my fuel system which shows no negative effects.

That's where my opinion comes from and many others have done similar so when exactly are our injectors going to be ruined?

From the report conclusions:
''Engine test results show that a 200:1 blend of 2-stroke oil in diesel results in a 2% loss of engine power in a 16 hour test due to injector fouling, a risk that would apply to any common rail diesel engine, but could also worsen fouling in older engines''...
Having come to that experimental conclusion (NOT by extrapolation) they obviously didn't see the need to continue the practical test to replicate tens of thousands of miles of driving.

As on the Honda forum, opinion will obviously be divided on this issue. Personally I see the benefits of adding of 2T to diesel fuel as akin to homeopathy; ineffective but mostly harmless (unless you have a DPF).

[cheshired5]

Originally Posted by Zebster

From the report conclusions:
''Engine test results show that a 200:1 blend of 2-stroke oil in diesel results in a 2% loss of engine power in a 16 hour test due to injector fouling, a risk that would apply to any common rail diesel engine, but could also worsen fouling in older engines''...
Having come to that experimental conclusion (NOT by extrapolation) they obviously didn't see the need to continue the practical test to replicate tens of thousands of miles of driving.

As on the Honda forum, opinion will obviously be divided on this issue. Personally I see the benefits of adding of 2T to diesel fuel as akin to homeopathy; ineffective but mostly harmless (unless you have a DPF).

If the tests are reliable and such a noticeable deterioration happens after just 16 hours, it would be reasonable to extrapolate further that my injectors after 17 years should be some kind of clogged mess and my engine performance would be down.
How come my injectors are fine after 17 years?

Are you saying that a 16 hour test with extrapolation is more credible than 17 years of continued usage?

[Zebster]

Originally Posted by cheshired5

If the tests are reliable and such a noticeable deterioration happens after just 16 hours, it would be reasonable to extrapolate further that my injectors after 17 years should be some kind of clogged mess and my engine performance would be down.
How come my injectors are fine after 17 years?

Are you saying that a 16 hour test with extrapolation is more credible than 17 years of continued usage?

Show me your peer-reviewed paper and I'll try to give you an honest answer! Seriously, it's hard to give judgement on unsupported anecdotes without causing offence but I'd perhaps speculate that maybe the zinc build-up will 'plateau out' rather than build up linearly with respect to time? Perhaps once it's built-up to a certain thickness the outer layer burns off? I honestly do not know and I'm not going to get into an argument; I've given supplied the thread with a link to some engineering/scientific findings and maybe those who wish to support the use of 2T should do likewise?

[mopedmick]

Originally Posted by cheshired5

If the tests are reliable and such a noticeable deterioration happens after just 16 hours, it would be reasonable to extrapolate further that my injectors after 17 years should be some kind of clogged mess and my engine performance would be down.
How come my injectors are fine after 17 years?

Are you saying that a 16 hour test with extrapolation is more credible than 17 years of continued usage?

This may be perfectly ok in a D5 of this vintage as this is first generation common rail technology, diesel fuel systems have changed a huge amount since & I would not take the risk on a modern generation vehicle .....

[cheshired5]

Originally Posted by Zebster

Show me your peer-reviewed paper and I'll try to give you an honest answer!

My fuel pressure readings are as new, it fast passes emissions every year and has the same power output as new so there is no deterioration.
This should not be possible if the injector fouling hypothesis is correct so peer reviewed or not, the results of that 16 hour experiment is not borne out by my real world data taken over several years.

There's no argument being had and there's certainly no offence taken as I decide what to do based on my long term experience rather than lab experiments by other people.

Originally Posted by mopedmick

This may be perfectly ok in a D5 of this vintage as this is first generation common rail technology, diesel fuel systems have changed a huge amount since & I would not take the risk on a modern geneation vehicle

Can you explain how diesel engines have changed and why 2 stroke in diesel is now a risk too far?
What will happen, why will it happen, how will it happen, how soon will it happen?

[DJT]

Based on the posted study, I don't think I'll be doing this.