R99 and R100 Renewable Diesel:
A Deep Dive Into the Future of Sustainable Fuel
Renewable diesel is rapidly becoming the fuel of choice for industries looking to reduce their carbon footprint without sacrificing performance. R99 renewable diesel is a near-perfect substitute for petroleum diesel, offering cleaner combustion and fewer emissions. But you may also have heard of R100 renewable diesel. In this blog, we’ll explain the key differences between R99 and R100, how they are produced, and why they are both significant for the future of diesel engines.
What is R100 Renewable Diesel?
R100 is a term used to describe 100% renewable diesel—a fuel that is made entirely from renewable feedstocks like animal fats, used cooking oils, and vegetable oils. R100 contains no petroleum diesel at all, which is why it’s called “R100.” This makes it a fully renewable alternative to conventional diesel.
The chemical composition of R100 is nearly identical to petroleum-based diesel, which means it can be used in any diesel engine without modifications. It meets the ASTM D975 specification for diesel fuel, making it fully compatible with diesel engines and infrastructure.
However, in the U.S., particularly under the Federal Renewable Fuel Standard (RFS), manufacturers are generally required to blend at least 1% petroleum diesel with renewable diesel in order to generate Renewable Identification Numbers (RINs), a key mechanism used to track renewable fuel credits . As a result, most renewable diesel available commercially is R99, which contains 99% renewable diesel and 1% petroleum diesel.
R99 vs. R100: What’s the Difference?
The key difference between R99 and R100 is the percentage of petroleum diesel content. R99 is a blend of 99% renewable diesel and 1% petroleum diesel, while R100 is pure renewable diesel with no petroleum content at all.
Why the 1% petroleum diesel in R99? There are a few reasons:
- Federal Regulations: In the U.S., as part of the RFS program, fuels must contain a small percentage of petroleum diesel to qualify for certain tax incentives and compliance credits. This makes R99 more common in the marketplace.
- Blender’s Credit: Producers and blenders of R99 can qualify for government subsidies, which helps offset the costs of producing renewable diesel. The 1% petroleum diesel blend ensures compliance with these financial incentives.
In practice, the difference between R99 and R100 is minimal from an operational standpoint. Both fuels perform similarly in diesel engines, offering the same benefits of cleaner combustion, improved fuel efficiency, and lower greenhouse gas emissions.
The Environmental Benefits of R99 and R100
Both R99 and R100 renewable diesel provide significant environmental benefits compared to traditional petroleum diesel. The use of renewable feedstocks like used cooking oil, agricultural waste, and animal fats results in up to 75% lower greenhouse gas emissions over the lifecycle of the fuel.
Additionally, because renewable diesel contains no sulfur or oxygen, it burns cleaner, producing fewer particulates and reducing the buildup of soot in Diesel Particulate Filters (DPFs). This results in fewer regeneration cycles, less maintenance, and longer engine life, all of which are major advantages for fleet operators.
R100 and R99 in Emissions Regulations
Some regions, like California, have adopted stricter emissions regulations that promote the use of renewable diesel. The California Air Resources Board (CARB), for example, requires the use of R99 or R100 in certain applications, such as commercial harbor craft . This regulation is designed to reduce emissions in the shipping and marine industries, which are significant contributors to air pollution in coastal regions.
Similarly, California’s Low Carbon Fuel Standard (LCFS) incentivizes the use of low-carbon fuels like R99 and R100 by tracking the carbon intensity (CI) of fuels and providing credits to users of renewable diesel.
How R99 and R100 Impact Diesel Particulate Filters (DPFs)
One of the key advantages of R99 and R100 renewable diesel is their positive impact on DPFs. Traditional petroleum diesel produces higher levels of particulate matter, which can clog DPFs over time and require frequent regeneration cycles. This leads to increased maintenance costs and engine downtime.
However, R99 and R100 produce fewer particulates and less soot, which means that DPFs stay cleaner for longer, and regeneration cycles are less frequent. This extends the lifespan of the DPF and reduces maintenance costs for fleet operators. In fact, some users report seeing significant reductions in the frequency of DPF regenerations after switching to renewable diesel.
Will Other Engine Manufacturers Follow Scania’s Lead?
As renewable diesel becomes more widespread, engine manufacturers are paying attention. Scania has been a pioneer in designing diesel engines that meet emissions regulations without the need for DPFs, relying on advanced Selective Catalytic Reduction (SCR) and Exhaust Gas Recirculation (EGR) technologies.
But what about other major engine manufacturers like Cummins, Paccar, and Detroit Diesel?
Cummins has been focused on reducing emissions through DPFs, SCR, and EGR technologies. However, as R99 and R100 gain traction and prove their ability to reduce emissions without increasing maintenance needs, it is likely that Cummins will explore more advanced aftertreatment systems that require less frequent DPF regenerations.
Paccar (which produces Kenworth and Peterbilt trucks) continues to rely on DPFs and SCR systems, but the growing demand for renewable diesel and its benefits for DPF maintenance could push them to consider DPF-free engines similar to Scania’s approach.
Detroit Diesel, a subsidiary of Daimler Trucks, has already made strides with its OneBox aftertreatment system, which combines DPF, SCR, and EGR in one package. However, as renewable diesel becomes more widely available, Detroit Diesel may explore ways to minimize DPF reliance, especially for fleets that use R99 and R100.
The Future of Diesel with R99 and R100
The success of R99 and R100 renewable diesel fuels marks a pivotal moment in the diesel industry’s journey toward sustainability. These fuels offer fleet operators the ability to reduce emissions, lower maintenance costs, and improve fuel efficiency without sacrificing performance.
At DPF Guys, we recognize the transformative potential of renewable diesel, and we’re committed to helping our customers navigate this new landscape. Whether you’re already using R99 or are considering switching to renewable diesel, we can help optimize your DPF systems and ensure that your trucks remain compliant with emissions standards while minimizing downtime.
As the industry moves toward a future where renewable diesel like R99 and R100 becomes the norm, engine manufacturers will need to adapt. Whether it’s through designing DPF-free engines or optimizing current aftertreatment systems for renewable diesel, the future looks bright for operators looking to reduce their carbon footprint without compromising performance.
Conclusion
R99 and R100 renewable diesel are not just alternative fuels; they represent the future of diesel technology. Offering a cleaner, more sustainable option for fleet operators, these fuels can reduce greenhouse gas emissions, improve engine performance, and lower maintenance costs associated with DPFs.
As more states adopt renewable diesel mandates and major engine manufacturers consider how to incorporate these fuels into their designs, it’s clear that R99 and R100 will play a pivotal role in the diesel industry’s move toward sustainability.
For fleet operators looking to stay ahead of the curve, switching to renewable diesel and optimizing DPF systems is a smart investment. Contact DPF Guys today to learn more about how renewable diesel can benefit your fleet and help you meet emissions regulations without sacrificing performance.