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Old 04-30-2014, 06:25 AM   #1
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Diesel Fuel - Truck vs Reg Diesel

New to RV'ing with a 2002 Monaco Diplomat Diesel - Cummins. What grade of diesel fuel should be used. We see "Truck Diesel - something about lower sulfur" and "Regular or sometimes it says auto diesel" at various fuel plazas.
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Old 04-30-2014, 06:29 AM   #2
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Get whatever is least expensive; sometimes you can get into "car" diesel lane, that's the cheapest (due to taxes).
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Old 04-30-2014, 06:37 AM   #3
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It's all the same. It is now low sulfur. Just don't put the agricultural or farm diesel in it. It is colored red and not taxed and if caught with it you are in trouble if it is not in a tractor or farm equipment.
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Old 04-30-2014, 06:39 AM   #4
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Quote:
Originally Posted by sstehman View Post
New to RV'ing with a 2002 Monaco Diplomat Diesel - Cummins. What grade of diesel fuel should be used. We see "Truck Diesel - something about lower sulfur" and "Regular or sometimes it says auto diesel" and various fuel plaza.
"Truck Diesel" is low sulfur diesel meeting EPA specs, "auto diesel" may be biodiesel containing up to 15% vegetable or animal derived fuel. (disclaimer: layman's interpretation)
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Old 04-30-2014, 06:59 AM   #5
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Originally Posted by sstehman View Post
New to RV'ing with a 2002 Monaco Diplomat Diesel - Cummins. What grade of diesel fuel should be used. We see "Truck Diesel - something about lower sulfur" and "Regular or sometimes it says auto diesel" at various fuel plazas.

I suspect the signage has more to do with some states, Indiana being one, with a different tax structure for commercial trucks. The fuel itself is the same. In the US all diesel used in on the road vehicles must be ULSD. Depending on the location and time of year the diesel may have a % of bio. Up to B20 is pretty common.

Your Dip is a Cummins diesel. Probably an ISC. I believe Cummins has issued a statement that it's engines are ok with up to B20 biodiesel.


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Old 04-30-2014, 07:23 AM   #6
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From talking to the farmers and diesel mechanics in my area any fuel that you buy at the pump will contain some amount of "bio", i.e. it is not pure refined diesel. As a previous poster noted the "bio" portion may come from different sources.

You can get pure refined diesel from the distributors if you buy in bulk and have your own tank, as some of the farmers I talk to do. But it usually costs more per gallon.

Again as previously noted all fuel is now ultra low sulfur diesel (ULSD). Some states mandate signage that indicates how much "bio" is in the fuel, e.g. B15 means 15%, B20 means 20%, etc.
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Old 04-30-2014, 08:59 AM   #7
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The difference between truck and auto diesel is the size of the pump nozzle. The truck pump is larger and pumps a whole lot faster. The fuel is the same.
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Old 04-30-2014, 09:16 AM   #8
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The difference between truck and auto diesel is the size of the pump nozzle. The truck pump is larger and pumps a whole lot faster. The fuel is the same.
X2....
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Old 04-30-2014, 11:06 AM   #9
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The difference between truck and auto diesel is the size of the pump nozzle. The truck pump is larger and pumps a whole lot faster. The fuel is the same.

X2!
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Old 04-30-2014, 11:24 AM   #10
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Make sure to watch for pumps that are labeled "died diesel". We recently pulled into a co-op somewhere in Idaho and I had the nozzle in my hand ready to pump when I saw the sign saying that particular pump had the forbidden fruit, so to speak.
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Old 04-30-2014, 12:22 PM   #11
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Quote:
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It's all the same. It is now low sulfur. Just don't put the agricultural or farm diesel in it. It is colored red and not taxed and if caught with it you are in trouble if it is not in a tractor or farm equipment.
Quote:
Originally Posted by NukeRef View Post
"Truck Diesel" is low sulfur diesel meeting EPA specs, "auto diesel" may be biodiesel containing up to 15% vegetable or animal derived fuel. (disclaimer: layman's interpretation)

LSD, (Low Sulfur Diesel), does NOT meet today's EPA specs, (and it is no longer sold in the U.S. for "highway" use).
To conform to EPA regulations today's diesel fuel is ULSD,
(Ultra Low-Sulfur Diesel).

All U.S. truck stops, and/or gas stations, sell ONLY ULSD, (for "highway" use).... that's what the OP should be, (is?), using in his 2002 Monaco Diplomat Diesel.

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