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My knowledge is inadequate to address your question. I have always assumed that Grade 1 is better than Grade 2, which I have been told repeatedly (that #2) equates with fuel oil used for heating. From experience I am aware that most diesel fuel sold at filling stations is Grade 2, and I also know that truck stops advertise proudly the fact that they sell the very desirable RED #2 diesel fuel. My truck tank will accept both the slender auto nozzle, or the huge high speed nozzle that large trucks accept, and I have no hesitation in fueling at any tank I can reach, though I buy red diesel where it is available. On occasion, I have bought fuel with low sulphur content. It was not red, and I thought it was #1 and I also though that it was a lousy fuel for my Cummings Dodge pickup. Someone once told me (not necessarily accurately) that the #1 low sulphur stuff was for automobiles. Damned if I see any reason for that. I certainly have seen both cars and trucks use each of the fuels and certainly there is no legal requirement that either be used for a particular vehicle, and neither do I believe that the #1 would run better in an automobile than the #2. A diesel engine is a diesel, no matter what frame it is mounted in. Let me confess that what I perceive as running poorly may be simply suggesting that low sulphur fuel produces less power, and trucks generally need more power than autos. I do not know that to be true; it seems possible. I have been told, and I have seen, that sulphur makes the fuel "slippery" as it is burned so that it flows better through the fuel injectors. Well, I haven't seen slippery but it feels that way to the touch, and the engine runs better. Low sulphur fuel feels more "tacky" and the sulphur one can add to the fuel has an oil-like slipperiness. No doubt environmentalists would prefer the reduced sulphite pollution that I suspect the grade #1 fuel produces, but it obviously is not required because grade #2 is sold in most stations. |
