Fight the MA Clean Heat Standard Today! - LEARN HOW
Posted: October 27, 2025
Diesel fuel is an essential on-road and off-road energy source for countless businesses and municipalities on the South Shore — and across the country. If your business depends on diesel to operate effectively and profitably, it’s vital to have a fuel partner who understands the standards and regulations.
Frank Lamparelli is the diesel delivery company of choice from our home base in Canton to countless Massachusetts businesses. In this article, we will discuss the standards and regulations that impact the diesel fuel you use.
Yes, they certainly do. The U.S. Environmental Protection Agency advises that, while all diesel fuel must adhere to the Clean Air Act, or CAA (which vastly reduced the sulfur content of all diesel), states are able to make their own regulations and standards.
In Massachusetts, state vehicles that use diesel must use a blend containing at least 15% biodiesel. The Commonwealth is also exploring a “zero emission” vehicle mandate comparable to California’s.
Beyond CAA and Massachusetts-specific standards and regulations, there are other diesel classifications to consider.
When choosing diesel fuel, it’s important to know whether your vehicles or equipment require on-road or off-road diesel. Both fuels are ultra-low sulfur, with about 15 parts per million of sulfur, and both offer reliable performance. The key differences come down to use and cost.
On-road diesel is the undyed version of the fuel. It’s approved for all highway vehicles like trucks, buses, and passenger cars. Because it’s taxed for transportation use, it’s typically more expensive.
Off-road diesel, on the other hand, is dyed red to show that it’s tax-exempt. It’s intended for equipment that doesn’t travel on public roads — such as tractors, construction machinery and backup generators. While almost identical to on-road diesel, red-dyed fuel is prohibited for roadway usage. Putting it in a vehicle for highway use can result in steep fines. For that reason, it’s critical to use the correct fuel type for your application.
There are two main grades of diesel fuel: Diesel #1 and Diesel #2. Each serves a different purpose depending on operating conditions.
Diesel #1 (1-D) has a higher cetane rating, which means it ignites more easily, especially in cold temperatures. It contains fewer waxes and often includes additives that prevent gelling, making it ideal for winter driving or equipment frequently exposed to freezing conditions. However, it’s typically more expensive than other grades.
Diesel #2 (2-D) is the standard choice for most fleets and equipment operating in moderate climates. It’s more affordable and offers excellent energy content and lubrication, which supports fuel efficiency and engine longevity.
During colder months, fuel suppliers may offer winterized diesel, a blend of #1 and #2, providing the cold-weather reliability of Diesel #1 with the efficiency of Diesel #2.
These are just a few of the guidelines, standards and regulations that impact diesel fuel. The Frank Lamparelli team can assist you in developing a customized fuel delivery schedule for your on-road or off-road diesel needs. Reach out to us today to get started.