dieselolie

Diesel oil, or diesel fuel, is a petroleum-derived distillate used primarily in compression-ignition engines. It is heavier than gasoline and has a higher energy density, which makes it common in heavy‑duty and long‑distance transport. Diesel is produced by refining crude oil and formulated to meet ignition and sulfur specifications. In many markets, ultra-low sulfur diesel (ULSD) is required, with sulfur limits typically around 10 ppm in the EU and about 15 ppm in the US.

Common applications include road vehicles (cars, trucks, buses), locomotives, ships and stationary generators. Diesel can be blended with biodiesel to produce blends such as B20. In some countries, heating oils resemble diesel but may be taxed or dyed differently to distinguish transport use from heating fuel.

Key properties include high energy content, lubricity, and a cetane rating that influences ignition quality. The energy content is roughly 35 MJ per liter. Diesel fuels can gel in very cold temperatures and may require additives or heated storage. Proper storage, handling and spill response are important due to flammability and environmental risk.

Environmental and regulatory aspects include emissions of CO2, NOx and particulates. Sulfur reductions and emissions controls have driven cleaner diesel in many regions. The fuel is named after Rudolf Diesel, the inventor of the engine that used it, with usage dating to the late 19th century.