Clear Diesel
The undyed diesel commonly requested for diesel-powered road vehicles. Identify the equipment requirement and product already in the receiving tank; do not infer a product solely from the business type.
RESOURCES / PRODUCTS
Clear Diesel, Dyed Diesel and DEF
Identify the product for each vehicle, machine or tank and keep quantities separate when requesting several products.
Know which product belongs at each receiving point
Dyed Diesel
Often called red diesel or off-road diesel, it contains a red identifying dye and is commonly supplied for eligible non-highway uses. Permitted use and tax treatment depend on applicable rules; confirm eligibility for the intended use.
DEF
Diesel Exhaust Fluid is used by equipment with selective catalytic reduction systems. It belongs in a separate DEF tank, not the diesel fuel tank. Request it as a separate product with its own quantity.
Describe a mixed request clearly
A single location may need more than one product. List each receiving group separately so the products, quantities and available delivery arrangements can be reviewed.
| Receiving group | Product | Quantity detail |
|---|---|---|
| Diesel support vehicles | Clear Diesel | Estimated gallons for the listed vehicles |
| Eligible off-road machines | Dyed Diesel | Separate estimated gallons |
| Equipment requiring DEF | DEF | Separate quantity and receiving points |
Identify machine counts for direct fueling and tank capacity/current level for tank replenishment. Do not combine Diesel and DEF into one total. If Gasoline is also needed, list the required grade and quantity separately.
A combined request does not establish that every product will arrive together. Confirm the available arrangements for your location.
If the product or quantity is uncertain
- Ask the equipment or facilities contact to confirm the specified product.
- Identify the tank or equipment and share the relevant label or equipment information when requested.
- Mark quantities as estimates and identify what is unknown.
- Clarify any mismatch before delivery rather than choosing the closest product name.
Product identification is separate from tax eligibility. This guide does not establish permission to use Dyed Diesel in a particular vehicle or application.
Reference information: U.S. Energy Information Administration: off-road diesel terminology; IRS: current dyed-diesel guidance; Peterbilt: engine aftertreatment and DEF information. Follow the instructions for your own equipment.