03-26-2014, 12:29 PM | #1 |
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Diesel Fuel in North America
Looking to get an education as I planning to pull the trigger on a 320-d xDrive. In the US this diesel engine/vehicle is being "badged" as the 328d.
Are all diesel fuels the same in the US? On some threads I have seen what appeared to be different comments relating to what was available (mostly in UK & Europe). What are the differences? Do different Companies (i.e. Mobile, BP, Hess, Sunoco, Truck Stops, etc) in the US have different "grades" of diesel. Or, are they all the same? Are there different "rating" systems (akin to octane ratings 87, 89, 91, 93 on regular, Plus, HiTest/Premium gas)? Are there any things that I should be aware of? Any comments would be appreciated. Thanks, Last edited by ADM; 03-27-2014 at 07:20 AM.. Reason: clarification of the correct common name for the vehicle engine in the US |
03-26-2014, 05:15 PM | #2 |
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Diesel has a cetane rating (very similar to octane rating, best to think of it in the same way). In the UK, where we have a lot more experience of diesel cars, you can get 'premium' diesel - like the very high octane petrols.
Some people reckon they help with mpg, or make the car quicker to respond to the throttle. I can't be certain, as I know what fuel I've put in it, and that might make me change my driving style, but I seem to get 5% or so better fuel economy on Shell premium. I use the Shell premium fuel - used to be called Optimax, now something silly like 'V-power Nitro+'. My personal opinion is to use the best diesel that you can, unless the price gets silly. The premium Shell fuels cost 6-7 % more, but if I'm really getting 5% better economy then it's almost cost neutral. |
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03-26-2014, 10:14 PM | #4 | |
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I have also noticed that at a couple of stations in my area (where they carry diesel) the number on the pump is "40". Does that coincide with it being a "cetane" rating? |
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03-26-2014, 11:21 PM | #5 |
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Funny that you call it a 320d when you're buying it in the U.S. But same difference, eh?
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03-27-2014, 07:18 AM | #6 | |
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In Europe it is the 320d engine, which has been "badged" as the 328d for NA/US. Same engine. I guess I made the typo and did not properly refer to what it is being called in the US. Thanks for picking that up. Other than that, any other info? |
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03-27-2014, 08:23 AM | #7 |
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Not from me, sorry. I know as much as you do about the topic, so I'm eager to learn as well.
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03-27-2014, 08:27 AM | #8 |
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03-27-2014, 08:39 AM | #9 |
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Although it's from wikipedia (and therefore always to be taken with a pinch of salt) ...
Generally, diesel engines operate well with a CN from 40 to 55. Fuels with higher cetane number have shorter ignition delays, providing more time for the fuel combustion process to be completed. Hence, higher speed diesel engines operate more effectively with higher cetane number fuels. In Europe, diesel cetane numbers were set at a minimum of 38 in 1994 and 40 in 2000. The current standard for diesel sold in European Union, Iceland, Norway and Switzerland is set in EN 590, with a minimum cetane index of 46 and a minimum cetane number of 51. Premium diesel fuel can have a cetane number as high as 60.[2] In North America, most states adopt ASTM D975 as their diesel fuel standard and the minimum cetane number is set at 40, with typical values in the 42-45 range. Premium diesels may or may not have higher cetane, depending on the supplier. Premium diesel often use additives to improve CN and lubricity, detergents to clean the fuel injectors and minimize carbon deposits, water dispersants, and other additives depending on geographical and seasonal needs.[citation needed]. California diesel fuel has a minimum cetane of 53.[3] This also mentions and discusses the 'premium diesels' that are available. You can also get winterised diesels, which have different additives to prevent waxing in very cold temperatures - though I believe all modern BMWs have fuel heaters to reduce the likelihood of any problems And yeah. I've got a 325d. Which is a high performance version of the 320d. Or, in the US, the 325d would be the performance version of the 328d. Makes total sense, doesn't it |
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03-27-2014, 09:20 AM | #10 | |
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Yeah, I'm going to pay $1500 to "downgrade" from 328d to 325d engine specs with a tuning module.** That's stupid in more ways than one, eh robbiep? **The manufacturer, Kelleners Sport, claims that their module functions as a stand-apart ECU, much more sophisticated and easy on the motor than the typical resistor box like the old-style piggybacks. For $1500 they better be telling the truth! But perhaps it's just a pig(gyback) wearing lipstick...
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04-14-2014, 07:15 PM | #11 |
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In the United states diesel fuel is diesel fuel. There is a winter blend for some areas that get cold and regular diesel for the rest of us. There is no difference between on road diesel and off road diesel other than the dye that is placed in the fuel when it is shipped from the distributer. There may be slightly different levels of "cetane" but unless you fill er up with jack daniels, it is all pretty much the same. If we get more cars and light trucks here that require diesel then maybe it will be worth it to refine to a higher grade. but for now the vast majority of consumption goes into engines over 12 liters displacement. Just do not run vegetable oil through it. It's not a VW.
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04-14-2014, 08:06 PM | #12 | |
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Thanks, I hear you, and I PROMISE not to use the McD waste stuff in my tank~ It seems that there are more and more of us in NA shifting to Diesel --at least among the aficianados (read that as BMW good guys --not to be confused with the Petrol clan~ But I am NOT disssing you folks) soooooo maybe we can expand the population of diesel users and thus get better climate control emissions and BETTTTTTTER MPG~ Color me a "believer"~ |
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04-15-2014, 05:24 AM | #13 | |
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04-15-2014, 10:01 AM | #14 | |
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04-15-2014, 10:19 AM | #15 | ||
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04-15-2014, 07:47 PM | #16 |
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OP: Generally, I am of the belief that Chevron and Shell make the highest quality diesel - at least that's the case here in California. I called the Chevron fuel tech line and was told the sulfur content of no2 (ultra low sulfur diesel), which is the only diesel legal to sell in the US, in CA varies between 10-13 ppm sulfur. That is close to the premium diesel sold in Europe (10 ppm or lower depending on country). I think it's been mentioned that 15 ppm is the max sulfur in the US. Sulfur content of the fuel leads to sulphated ash deposits that screw with the diesel particulate filters (emission controls).
Cetane of Chevron no2 in CA varies between 50-52. Cetane rating signifies the readiness of the fuel to ignite when compressed, not the energy content of the fuel, tho higher cetane diesel probably feels like it's giving more power. Higher cetane does improve the cold starting of the engine. Shell has recently started to sell diesel formulated or blended with diesel made from natural gas (the so-called GTL or gas-to-liquid). If you see this at the pump or in ads don't dismiss it as marketing. GTL fuels and lubricants are the wave of the future - very, very pure and high performing. I read that pure no2 GTL diesel has a cetane rating of 77+. Aromatic content of the diesel fuel will affect its propensity to form soot or carbon deposits (bad thing for the emission controls). I've never seen any kind of aromatic ratings for no2 diesel, but the Chevron tech guy told me that CA limits aromatic content to about one third of what is allowed in other states (because of stricter particulate emission requirements). There is something called CARB no2 diesel (Califiornia Air Resources Board) and EPA no 2 diesel. Any EPA diesel refined in CA has to be shipped out of state. I think the trend everywhere in the US will be toward higher quality diesel. In the meantime, in CA we currently pay around $4.20 + for diesel - - as much, and sometimes more than, high test gas.
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08-10-2014, 08:31 AM | #18 | |
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08-24-2014, 09:05 PM | #19 | |
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09-06-2014, 05:45 PM | #20 |
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IME....
In the US, diesel is diesel. Although each refinery adds their own blend of additives based on the locale (colder areas in the winter get a "winterizing" blend to stop gelling). The best practice, coming from a CR-TDI person, is to buy your fuel from a high-volume diesel vendor. Any station that has truck pumps AND normal pumps is a good sign. On my TDI, I add in a splash of DieselKleen with each fill up.
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