What Is DieselNet and What Information Does It Cover?

DieselNet is an online information service focused on engines, fuels, energy, and clean transportation technology. It is aimed at readers who need to track emissions regulation, fuel standards, and engine technology developments rather than general automotive news. The site publishes a running news log plus longer technical papers, and some content sits behind a subscription.

What DieselNet covers

The site describes itself as covering engines, fuels, energy, and clean transportation technology. In practice, its content clusters around a few recurring themes:

• Emissions regulation — rulemaking and legal developments affecting vehicles, engines, and stationary sources.
• Fuel regulations and specifications — sulfur limits, renewable blending requirements, and country-level fuel summaries.
• Engine and emission control technology — technical guides on systems and combustion concepts.
• Market and policy context — fuel prices, oil supply forecasts, and related policy news.

How the content is organized

DieselNet mixes short, dated news items with longer reference material.

The Log

The Log is a dated news feed. Entries are short summaries that link to fuller items. Examples from the feed include:

• A US Department of Transportation final rule resetting NHTSA corporate average fuel economy (CAFE) standards for model years 2022–2031 passenger cars and light trucks.
• A retrospective on the DETR/SMMT/CONCAWE Particulate Research Programme, noting that when the project ran, road-vehicle particle legislation was based only on particulate mass (PM), and that the project's measurements showed PM did not capture the full picture of exhaust particle emissions.
• A US EPA final rule repealing most provisions of the 2024 Carbon Pollution Standards for GHG emissions from fossil fuel-fired power plants.
• A note that the US average diesel price crossed $6 per gallon for the first time, at $6.0556 according to AAA Fuel Prices, up from $3.7053 a year earlier, with regular gasoline at $4.2950 versus $3.1949 a year earlier.
• A federal judge temporarily blocking an effort to overturn, through congressional action, four EPA waivers issued for California emission regulations.
• Updated global and country fuel regulation summaries, including a new global table covering sulfur limits and renewables blending requirements, and updated summaries for Argentina and South Korea.
• A record US diesel crack spread exceeding $100 a barrel.
• An update to the DieselNet business page of Nett Technologies covering its emission control systems for stationary power generation engines.
• An IEA revision reducing its 2026 global oil supply forecast, with output projected to decline 4.3 million barrels per day on average that year and a projected market deficit of 1.27 mb/d in 2026 and 1.8 mb/d between July and September.

Technology guides and papers

Longer technical material is also published and revised. One example from the feed: the discussion of Ducted Fuel Injection was expanded and restructured into a separate paper. This pattern — a topic outgrowing a section and becoming its own document — is how the technical library grows.

Business pages

The site also hosts business pages for companies in the emissions control space, such as the Nett Technologies page highlighting its portfolio for stationary power generation engines.

Who it is useful for

DieselNet is most relevant if you need to:

• Follow emissions and fuel regulation as it changes, including US federal rulemaking and California waivers.
• Look up fuel specifications and sulfur or blending requirements by country.
• Understand engine and aftertreatment technology at a technical level.
• Track fuel price and oil supply signals that affect the diesel and transportation sector.

It is less suited to consumer car buying or general product reviews.

Access and subscription

The site has a Subscribe page at https://dieselnet.com/subscribe, and subscription-related language appears in its pricing signals. That means at least some content is likely gated. The available material does not specify which pages are free versus paid, what a subscription costs, or what a subscription includes, so check the Subscribe page directly before assuming any particular article is open.

Practical starting points

• For current developments: start with The Log, which is dated and links out to detail.
• For background: look for the technology guide papers, which are revised over time.
• For regulatory reference: use the fuel regulation summaries and country tables.
• For access questions: consult the Subscribe page to confirm what is included.