Diesel Additives

I agree with everything you just said. If I could buy such a thing as premium diesel here, and if it was cheaper than adding chemtech to my tank, then I'd buy it instead. However, the premium is not available everywhere in Australia so I'd still rather use the additive and plain diesel approach. I still don't know if you are agreeing that we shouldn't be putting 2 stroke in our diesel or if you are disagreeing that we shouldn't worry about which companies fuel we put in our tanks? :rolleyes:;)

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Originally Posted by Rick122

I still don't know if you are agreeing that we shouldn't be putting 2 stroke in our diesel or if you are disagreeing that we shouldn't worry about which companies fuel we put in our tanks? :rolleyes:;)

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No comment on the adding 2 stroke oil debate. Seems to be one of those topics that divides people with as many swearing by it as those who don't agree.

I would not worry about regular diesel bought from the major companies. Just be careful of the independents who have been known to blend in different sources, like bio-diesel, and cover themselves with a small label on the bowser telling you it "may have bio-diesel". No issue if you know what you are getting, and know what you want.

As far as the "premium" fuels debate goes, again seems to generate as much divided opinion. Having said that I have seen independent test which support there is a cleaning benefit and even a benefit of reduced fuel system corrosion, and depending on the state of the engine to start with, this cleaning benefit can restore performance or improve economy - even if the benefit is marginal and unmeasurable outside of a lab. Gets down to how much extra you are paying for any of the additive options.

And never underestimate the placebo effect. If you think you are getting better economy, chances are subconsciously you are adjusting your driving patterns and helping deliver this improvement. But now I have just gone off the deep end....heh heh...

One final comment, with the Td5 it probably does handle the most variable quality fuel you can get well. With my BMW 320d, I will only put the best in it - BMW even state must not use bio-diesel. With the TdV6 I am sure regular diesel is just fine.

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Originally Posted by Rick122

Until someone does a proper test like this to show any benefit to adding 2 stroke to diesel, I won't use it. I'd much rather use a proper additive like chemtech.

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i completely agree with your attitude, i've started adding the 2 stroke(approx 150.000km ago) based only on several posts especially from UK forums(without any scientific backup) and i felt a kind of improvement myself, mainly in engine sound...though i'm regularly using a diesel treatment too which i presume is not very popular down under, this one Metabond Megasel diesel fuel additive shop for sale in Romania - Metabond Technology

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Originally Posted by discorevy

Yes onebob , I was just doing a quick Calculation based on my average hwy consumption (10.5 litres /hundred) from a brimmed tank (> 95 litres) works out to around 1400 kilometers.......

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I am a little confused here. If you are getting 10.5L/100km and have a 95L (useable) tank then you will achieve around 905km not 1400km. To achieve 1400km you need to be getting around 6.8L/100km. I've never heard of someone achieving that at highway speeds.

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Originally Posted by Mundy

I am a little confused here. If you are getting 10.5L/100km and have a 95L (useable) tank then you will achieve around 905km not 1400km. To achieve 1400km you need to be getting around 6.8L/100km. I've never heard of someone achieving that at highway speeds.

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If statements by original posters were read in context there should be no confusion.
One bob stated that he was getting between 10 & 14 l/100km - a 4l/100km difference (improvement?).
No one said they were getting 1400kms from a 95l tank.

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Originally Posted by onebob

I dose every fill with a diesel additive but there have been periods where i didn't for one two or three tanks in row and my son (who's always following :p) say's it smokes less on the additive and cos i do record the fuel economy i can verify that the difference is 2 > 4 litres / 100k.

onebob

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Mundy , this was onebobs first post on this thread , so from this I calculated if the improvement was up to 4 litres per hundred, then based on my highway consumption (10.5 l/hundred) hypothetically would equate to 6.5 l/hundred ,so around 1400k range, now I know this isn't possible, therefore had a gentle dig

I'd love to know what I was getting as I 'cruised' down the M1 in the heavy rain last friday.

I was sitting back from the mad arabs at a steady 65kmh torque convertor locked up and just over 1200rpm on the tacho with about 3psi boost on.

Someone with scientific calculator and mind might work it out but it was significant on my fuel guage.

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Originally Posted by discorevy

Yes onebob , I was just doing a quick Calculation based on my average hwy consumption (10.5 litres /hundred) from a brimmed tank (> 95 litres) works out to around 1400 kilometers....... BUT , only if using the additive used by yourself, which you say can give you up to 4 litres /hundred improvement, hence my inquiry as to which additive:D you didn't mention that you sometimes get 14 litres / hundred in your original post

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Mundy maybe you should have read the whole post rather than just pick out a bit so you can feign confusion

Bloody hell, how often does this get trawled over ? :(

And everyone has an opinion, this one is best, no this one, but how do you know ? ;)

My mates best friends cousin knows a bloke who posted on a forum that he categorically can state that the bloke at the loading dock at Castrol said...... :angel:

Have any of you done used oil analysis to see if the additive is reacting with the soft metals in the engine ?
I'm talking lead, tin aluminium, bronze,
There's this thing called blow-by, combustion gases make their way into the crankcase, this is why Caltex recommend that their famous Techron petrol additive only be used once or twice per oil change period.

Has anyone pulled an engine down and checked deposit levels, or the lack thereof ?

As already said by a number of posters, modern ULSD has to meet the Oz standard for lubricity, it's a wear metal scar, an actual measurement and is more stringent than during the pre high sulphur diesel days.

Nothing wrong with wanting a little extra protection, particularly for us running older mechanical VE style pumps that use the diesel as lubricant, but you are probably more likely to have a problem with seal/O ring shrinkage or water contamination than wear these days.

As Rick said, more engines fuel systems are destroyed by filter neglect and contamination than by any actual fuel deficiency.
Cheers Scott