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  #1  
Old 04-25-2006, 11:21 AM
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New type Diesel fuel

Does anyone know what effect the new type of Diesel fuel that's due to come out in a few months is going to have on our older Mercedes diesel engines?

The way I understand it the current type of Diesel fuel will be discontinued, at that time.

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Old 04-25-2006, 11:46 AM
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Essentially it just has lower sulfur, so lubrication properties of the fuel will go yet lower, so it may be a good idea to use a bit of fuel additive on each fillup, like 1/3 or half a bottle of powerservice or something, just to add the extra lubing for the barrels in the injection pump. Thats what I will probably do...you can also just put in one of those little "pints" of 2 stroke oil that you'd use with yard equipment, or a half a quart of clean motor oil....anything like that would help the lubricity. I'll be doing one of them....probably whichever I have on hand at the time (likely general gasser motor oil)
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  #3  
Old 04-25-2006, 11:50 AM
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It's ok to just put a little regular motor oil in the tank? Doesn't really matter which? Wonder if that will increase smoking...
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Old 04-25-2006, 11:53 AM
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If its a light gasser motor oil (clean/new) and a quart or less I'd guess that the smoke difference would be extremely minimal, but it'd help overall lubrication....maybe I'll dump a quart into mine next fillup to see how it reacts.....it could be a while though, my next fillup is in about 2.5-3 weeks at my current severely-reduced amount of driving.....
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  #5  
Old 04-25-2006, 12:40 PM
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by light, do you mean stuff like 5w30 or something?

what about Lubro-Moly's "Diesel Hi-Test"? Does it provide any lubrication?
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  #6  
Old 04-25-2006, 12:57 PM
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guys, the new ULSD will meet ASTM D975 standard which specifies lubricity and that standard has to be met for #1D and #2D. Lubricity standard is defined by 520 microns HFRR maximum.


if you're truly concerned about this, toss in a little biodiesel - - 2% is more than adequate.
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Old 04-25-2006, 01:01 PM
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Well actually Lubro-Moly is probably a bad idea because it's generally not sold in stores, and I don't want to buy crates of that stuff online so i have some for every fill-up...

a can of Hi-Test treats 20 gallons - that's one full tank. Costs 5 bucks each... another expense to pile on... Maybe there's a more economical alternative that does the trick...
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Old 04-25-2006, 01:12 PM
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most of the mainstream additives enhance lubricity. I suspect Power Service DFS (white bottle) is the least expensive and can be purchased at Wallysmart, Autozone, etc. it's pretty cheap in the 96oz size. They added a bit of Methyl Soyate at the last re-formulation.
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Old 04-25-2006, 01:12 PM
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Does anyone have reason to believe this is an actual concern? I have not heard anything to indicate that we need to do anything different with ULSD. AFAIK, these engines are doing just fine in europe with ULSD. I just don't think the sky is falling yet.
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Old 04-25-2006, 01:15 PM
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Quote:
Originally Posted by Craig
Does anyone have reason to believe this is an actual concern? I have not heard anything to indicate that we need to do anything different with ULSD. AFAIK, these engines are doing just fine in europe with ULSD. I just don't think the sky is falling yet.
Absolutely. There is more old diesel infrastructure out there than there is for gassers -- for example virtually no one is still using carburetors. If the majority of injection pumps on the road require some lubricity, the new fuel will have a lubricity additive. No big deal.
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  #11  
Old 04-25-2006, 01:26 PM
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The ultra low sulfur diesel has been available in kalifornia for a while now and it has no effect on the Bosch injection pumps. The pumps used in our old MBs are lubricated by engine oil not by diesel oil. No additives are needed just clean fuel. According to the veteran MB DIY Marshal Booth, these pumps were even used in some gassers which has no lubricative properties at all.
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  #12  
Old 04-25-2006, 01:26 PM
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A member on another Mercedes forum, where I posted the same question provided a link where the characteristics of the new Diesel fuel are described.

http://chevron.com/products/prodserv/fuels/diesel/faq.shtml

I just read that link and this does not sound good at all, especially the section where Chevron states that there is a good chance that rubber seals throughout the injection system may dry up and start leaking. Apparently lubricity IS NOT the problem, but dried out "O" rings and seals are. Chevron also state that fuel additives will not help.

This is not good.

Phil
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Last edited by pberku; 04-25-2006 at 01:34 PM.
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  #13  
Old 04-25-2006, 01:38 PM
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Quote:
How Will the Change Affect Seals?

Seals in contact with diesel of high aromatic content often absorb the aromatic compounds, which makes the seals swell. If diesel with a lower aromatic content is then used, the seals may shrink back. The combination of seal shrinking and pre-existing ageing effects such as compression set or twisting can lead to seal failure and leaks.

Overseas and domestic experience suggests that the seals most susceptible are Nitrile Butadiene Rubber (NBR) seals in Bosch type Denso or Zexel rotary fuel injection pumps. More specifically, older (at least 6 years) cover seals and throttle shaft O-ring seals may be affected. These susceptible components occur most often in pre-1995 Japanese or Korean light diesel vehicles.

Some diesel owners may wish to replace fuel injection pump seals before the change to lower sulphur diesel. The Ministry's research suggests the introduction of lower sulphur diesel simply emphasises the need for regular maintenance of diesel engines. But diesel owners and mechanics should look for the tell tail signs of a fuel pump leak such as a reduction in fuel efficiency, smoky exhaust or visible signs of a diesel leak.

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  #14  
Old 04-25-2006, 01:58 PM
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Which is exactly why I said before that switching from dino oil to synthetic may result in oil leaks, since the dino oils have some aromatics that swell the seals whereas the synthetics do not.

But back to the original question... This article seems to suggest that while perhaps it's not so much the pump that needs lubricating, but it's the seals that will shrink and leak. Now, many will probably say - replace your seals... That's time and $$$. Eventually. But for now, perhaps additives may solve that problem.
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  #15  
Old 04-25-2006, 02:07 PM
Craig
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This would be a good time to go into the snake oil business.

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