How to Compare ULSD and LSD Auto Fuels

As of June 1, 2006, the United States has been on a path to total conversion to ULSD auto fuel use. ULSD is more environmentally friendly than LSD fuel, as it produces far fewer emissions. All 2007 and newer diesel engines are now required by law to use ULSD fuel. By 2010, all diesel engines will have to use it. Fuel experts say that there are really no discernible differences between ULSD and LSD auto fuels. However, there are a few subtle differences that you may want to compare for your own information.

Instructions

Difficulty: Easy

1. Compare the efficiency of ULSD and LSD fuels. Most highway tests have shown that there is little to no difference between the two fuels in this area. LSD fuel may have a slight edge in 2006 and older model cars, but anything newer has been built specifically to take ULSD fuel.
2. Be careful when using ULSD fuel in electrical equipment. It has less conductivity than LSD fuel, so you've got to pay particular attention to grounding and other safety measures. You wouldn't want to get shocked, after all!
3. Compare the cost of ULSD and LSD auto fuels at your local gas station. ULSD fuel is slightly more expensive to produce, and so may be a few cents more expensive per gallon than LSD fuel. However, any price difference between the two is likely to be very small.
4. Look at the lubrication properties of both types of fuels. LSD fuel is naturally better at engine lubrication than ULSD. However, most bulk oil providers are using additives in their ULSD fuels that compensate for this, making the lubricating abilities of both fuel types about the same.
5. Examine the waxing tendencies of both fuel types. ULSD fuel is naturally more waxy than LSD fuel. However, with the use of the right additives and with proper engine maintenance, you shouldn't have too much trouble with cold weather waxing from your ULSD fuel. Most manufacturers put anti-waxing additives into the fuel before you even buy it.

Tips & Warnings

• If your engine is a 2006 model or older, you can still use LSD fuel in it until 2010. However, it won't hurt the engine to put ULSD fuel in it.
• Never use red diesel fuel in a car intended for highway use. Red diesel is intended for industrial equipment and boats only and is illegal for use in autos. If you're caught using it, the legal penalties could be severe, even if it's ULSD fuel.