Katerina Swanson
TOP TIER™ Diesel Fuel is a performance specification developed by leading automotive and heavy-duty equipment manufacturers. It is sponsored by General Motors, Volkswagen, Daimler Truck, Navistar, and Ford, and recommended for both heavy and light-duty vehicles. The TOP TIER™ Diesel Fuel Performance Standard requires additive packages to reduce deposits on internal and external injectors, improve lubricity, improve fuel stability, and reduce water and particulate contamination. The TOP TIER™ Station Finder app helps users find gas stations that offer TOP TIER™ Approved Fuels, ensuring they are always just a tap away from the highest quality detergent fuel available. While some people debate the need for Top Tier diesel fuel, others swear by it for maintaining fuel economy and reducing maintenance costs and vehicle downtime.
| Characteristics | Values |
|---|---|
| Defined by | Cetane rating above 40 |
| Performance standard | Used with regional specifications or regulations |
| Performance standard requirements | Additive packages to reduce deposits on internal and external injectors, improve lubricity, improve fuel stability, and reduce particulate and water contamination |
| Fuel injection systems | High-pressure common rail (HPCR) |
| Fuel injection system function | Better regulation of fuel pressure and injection timing for cleaner combustion |
| Fuel injection system technology | Implementation of catalyst emissions control devices like Diesel Oxidation Catalyst (DOC), Diesel Particulate Filter (DPF) systems, and Selective Catalytic Reduction (SCR) |
| Sponsors | General Motors, Volkswagen, Daimler Truck, Navistar, International, Detroit Diesel, and Ford |
| Recommended for | Heavy and light-duty vehicles |
| Purpose | Promote better fuel quality, maintain fuel economy, reduce maintenance costs, and reduce vehicle downtime |
| Additives | Detergents that help break down carbon in injectors and engines |
| Top Tier Diesel retailers | Costco, Arco, and QuikTrip |
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What You'll Learn
TOP TIER™ Diesel Fuel Performance Standard
The TOP TIER™ Diesel Fuel Performance Standard was created in 2017 to promote better fuel quality, maintain fuel economy, reduce maintenance costs, and reduce vehicle downtime. The standard requires additive packages to:
- Reduce internal and external injector deposits
- Improve lubricity to decrease wear on pumps and injectors
- Improve fuel stability
- Reduce particulate and water contamination
Today's diesel engines utilize high-pressure common rail (HPCR) fuel injection systems that better regulate fuel pressure and injection timing for cleaner combustion. This technology also allows for the implementation of catalyst emissions control devices such as Diesel Oxidation Catalyst (DOC), Diesel Particulate Filter (DPF) systems, and Selective Catalytic Reduction (SCR). These advancements have resulted in higher operating pressures and tighter tolerances for moving parts in fuel pumps and injectors, driving the need for improved fuel quality.
The TOP TIER™ Diesel Performance Standard is designed to be used in tandem with regional specifications or regulations and provides benefits to drivers, retailers, and OEMs by improving fuel quality to meet the increasing demands of engine technology. Retailers voluntarily join the TOP TIER licensing program to supply a higher standard of fuel that meets the TOP TIER™ requirements.
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TOP TIER™ Approved Diesel Program
TOP TIER™ is a high-quality fuel performance standard developed by leading automotive and heavy-duty equipment manufacturers. It is an industry consortium led by GM, which initially started with gasoline and later included diesel. The TOP TIER™ Approved Diesel Program is currently sponsored and overseen by General Motors, Volkswagen, Daimler Truck, International, and Ford. It is recommended for both heavy and light-duty vehicles.
The TOP TIER™ Diesel Fuel Performance Standard requires additive packages to:
- Reduce internal and external injector deposits
- Improve lubricity to decrease wear on pumps and injectors
- Improve fuel stability
- Reduce particulate and water contamination
Water is the most common type of contamination in diesel fuel. If introduced into the vehicle fuel system, it can lead to corrosion, increased metal wear, ice during cold weather, plugged filters or screens, increased fuel degradation, and microbial growth. TOP TIER™ Diesel Fuel suppliers take measures to protect against water in their fuel storage and dispensing equipment and must have a TOP TIER-approved water detection process in place.
Today's diesel engines utilize high-pressure common rail (HPCR) fuel injection systems that better regulate fuel pressure and injection timing for cleaner combustion. This technology also allows for the implementation of catalyst emissions control devices like Diesel Oxidation Catalyst (DOC), Diesel Particulate Filter (DPF) systems, and Selective Catalytic Reduction (SCR). These advancements have resulted in higher operating pressures and tighter tolerances for moving parts in fuel pumps and injectors, driving the need for improved fuel quality.
The TOP TIER™ Approved Diesel Program was created to promote better fuel quality to maintain fuel economy, reduce maintenance costs, and reduce vehicle downtime. TOP TIER™ Fuel Standards are developed by top auto manufacturers to improve engine performance.
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Cetane rating
The cetane number of a fuel is defined by finding a blend of cetane and isocetane with the same ignition delay. Cetane has a cetane number of 100, while isocetane's measured cetane number is 15. Once the blend is known, the cetane number is calculated as a volume-weighted average, rounded to the nearest whole number. The scale for measuring cetane ranges from 0 to 100, with higher numbers being better.
The cetane rating of a specific diesel mixture is based on the amount of cetane in the fuel. Cetane is a clear, colourless hydrocarbon that ignites easily under pressure. Pure cetane represents the highest purity of diesel fuel possible and has a cetane rating of 100.
The cetane number is an important factor in determining the quality of diesel fuel, but it is not the only one. Other measurements of diesel fuel quality include energy content, density, lubricity, cold-flow properties, and sulfur content. Generally, diesel engines operate well with a cetane number ranging from 48 to 50. Modern highway diesel engines tend to require fuel with a cetane number within the range of 45 to 55. Regular No. 2 diesel typically has a cetane number of 40 to 42, while premium diesel fuel can have a cetane number as high as 60.
The cetane number is also related to the ignition delay of the fuel. It measures the time between when the fuel is injected into the chamber and when combustion begins. Higher cetane number fuels have shorter ignition delays, resulting in more complete fuel combustion. This shorter delay time leads to improved engine performance, increased fuel economy, reduced emissions, and better power output.
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TOP TIER™ Station Finder app
TOP TIER™ is a high-quality fuel performance standard developed by leading automotive and heavy-duty equipment manufacturers. TOP TIER™ Diesel Fuel was created in 2017 to promote better fuel quality, reduce maintenance costs, and reduce vehicle downtime. TOP TIER™ Diesel Fuel is defined by a Cetane rating that is above 40, indicating the presence of fuel additives.
The TOP TIER™ Station Finder app helps users locate TOP TIER™ Authorized Fuel Retailers of TOP TIER™ Approved Fuels. The app is useful for planning a road trip or finding a local fill-up, as it guides users to stations with high-quality detergent fuel. The app also features an Opinion Feedback tool, allowing users to share their thoughts and provide feedback to improve the app.
TOP TIER™ is an industry consortium led by General Motors, which initially focused on gasoline before expanding to diesel fuel. The consortium includes other leading automotive manufacturers such as BMW, Toyota, and Honda, as well as Audi, Daimler Truck, Ford, and Volkswagen. These manufacturers recommend TOP TIER™ fuels for both heavy and light-duty vehicles.
The TOP TIER™ Diesel Fuel Performance Standard requires additive packages to reduce deposits on injectors, improve lubricity, enhance fuel stability, and reduce water and particulate contamination. Water contamination is a significant issue in diesel fuel, as it can lead to corrosion, increased metal wear, and microbial growth. TOP TIER™ Diesel Fuel suppliers implement measures to protect against water contamination and have approved water detection processes in place.
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TOP TIER™ Fuel Standards
TOP TIER™ is a high-quality fuel performance standard developed by leading automotive and heavy-duty equipment manufacturers. It was collaboratively introduced in 2004 by General Motors, BMW, Toyota, and Honda, and TOP TIER™ Approved Gasoline and Diesel have become synonymous with exceptional fuel quality and engine care. The TOP TIER™ Approved Diesel Program is currently sponsored and overseen by General Motors, Volkswagen, Daimler Truck, Navistar, International, and Ford, and is recommended for both heavy and light-duty vehicles.
The TOP TIER™ Diesel Fuel Performance Standard requires additive packages to:
- Reduce internal and external injector deposits.
- Improve lubricity to decrease wear on pumps and injectors.
- Improve fuel stability.
- Reduce particulate and water contamination.
Water is the most common type of contamination in diesel fuel and if introduced into the vehicle fuel system can lead to corrosion, increased metal wear, ice during cold weather, plugged filters or screens, increased fuel degradation, and microbial growth. TOP TIER™ Diesel Fuel suppliers take measures to protect against water in their fuel storage and dispensing equipment and must have a TOP TIER-approved water detection process in place.
Today's diesel engines typically utilize high-pressure common rail (HPCR) fuel injection systems that better regulate fuel pressure and injection timing for cleaner combustion. This technology also allows for the implementation of catalyst emissions control devices like Diesel Oxidation Catalyst (DOC), Diesel Particulate Filter (DPF) systems, and Selective Catalytic Reduction (SCR). These advancements have resulted in higher operating pressures and subsequently tighter tolerances for moving parts in fuel pumps and injectors, in turn driving the need for improved fuel quality.
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