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From what I know when diesel fumes exits the exhaust they fall to the ground where gas fume go into the atmosphere.
 

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Hi,
Diesel is very dirty, & causes health problems,(heart & lungs)they are doing somewhat better now that most of the sulfur has been removed from the fuel, & electronic engine controls, but don't forget the older diesels that don't have the electronics to control them, also farm equipment, they get to use high sulfur fuel, & are very big polluters, along with ships, & trains, Here in pa. diesels are exempt from emissions checking, because they can't pass. So to answer your question, Diesels do pollute more then gas engines.
take care & keep safe,
rich
 

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matt167 said:
diesel engines are now running just as clean, or cleaner than gas.

I concur with Matt-

We now have Tier II Emissions requirements on off-road Diesels, and I believe in 2007 (maybe '08?) we'll have Tier III. You can't hardly buy a big inch Diesel today that doesn't have Electronic Fuel Injection (of one sort or another). I understand that Catalytic Converters are on the way, but I just bought a new 2007 Freightliner Columbia for one of our stores last week and it doesn't appear to have one.

Diesels are big in Europe-I wonder, are they that far ahead of us in Diesel Technology, or are they using them for fuel economy (or both)?
 

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35WINDOW said:
Diesels are big in Europe-I wonder, are they that far ahead of us in Diesel Technology, or are they using them for fuel economy (or both)?
the US was once 1 of the biggest polluters for automobiles, now, the US is 1 of the cleanest for emmisions as far as auto's go. our emmisions standards are far tighter than any other nation. Europe's emissions standards are fairly loose.
 

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in 07 all diesels made will have a particulate trap. new oil and ultra low sulpher is already here to meet the 07 emissions. in 2010 it gets better,the diesel will put out cleaner air than it intakes from most big cities.
 

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I said the newer ones are doing better, but they are few compared to how many old ones are out there, & they're not lining up to retro fit any emission
equipment, As for the farm fuel, I saw a sign on the diesel pump "off road vehicles only" so I asked the guy what that was about, he said "it has a high sulfur content the farmers use it", that was in New Jersey, So if that's not the case anymore I stand corrected.

rich
 

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The biggest reason for "off road use only" is the TAXES charged for road use, not sulfur content. I'm not saying that the off road fuel isn't higher sulfur (though I doubt it -- would it pay to refine two different types? Might, but...), but the diesel for farm use is cheaper because the road taxes aren't applied.
 

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hay farna,

That makes a lot more sense then what I was told, but at the time I had no
reason not to believe him, after all he's buying & selling the stuff, I suppose
some people will tell you anything just so you leave them alone.
thanks,
rich
 

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Until very recent years it was pretty close to even. Diesels do emit more nitrous oxides (greenhouse gas) and particulate matter than gas engines. The particulate matter is that black cloud we've all seen from a diesel going up a steep hill. Just because some diesel exhaust is easily visable to the eye many people have been fooled into thinking it's "dirtier" than gasoline which actually makes more nasty stuff out the tailpipe but it's generally not visible. Comparisons of pollution have to be tempered by the fact that diesel and diesel engines are just more efficient. You can get more useful work/miles out of a gallon of diesel than a gallon of a gasoline. Burning less fuel to get to the grocery store means you are also polluting less. So comparisons between the two fuels tends to be a tricky apples to oranges type thing.
In the last few years, many of the gas cars are very running very clean. Likewise the diesels and when all the new EPA diesel regulation stuff gets enacted and sorted out the diesels will run even cleaner. It'll likely be even tougher to say.
Biodiesel throws us a good loop. It pollutes less than either fuel but is less efficient than regular diesel. And then we have E85....I frankly can't yet offer an opinion on either. I believe both have great potential for cleaner fueling though.
 

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farna said:
The biggest reason for "off road use only" is the TAXES charged for road use, not sulfur content. I'm not saying that the off road fuel isn't higher sulfur (though I doubt it -- would it pay to refine two different types? Might, but...), but the diesel for farm use is cheaper because the road taxes aren't applied.
Taxes and dye is the only difference as far as I know. They add dye to the off road fuel so it can be easily checked. There is a big fine for using the off road diesel on the road. I have a friend that loves to buy diesel cars and burn off road diesel in them since he has never heard of the authorities checking a car's fuel. As far as he knows they only check pickups and trucks.
 

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The "road use taxes" thing holds true for aviation fuel also. Having worked in that industry for years as an operations manager, there were many times when guys would come to the airport to by 100 octane avgas for there cars on the way to the drag strip. Because of the tax issue we weren't supposed to sell it to them :nono: . But, I wasn't to concerned about a few pennies for the roads standing in the way of a competive day at the strip. I sure couldn't see where ten gallons of 100 octane would make a difference in how much work, if any, would be done to our roads :rolleyes:
 
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