- Definitions of Bio-Based Diesel Fuels
- Mercedes Benz / Daimler Approval Concerning Biodiesel
- Frequently Asked Questions on Biodiesel Fuel Issues
- Frequently Asked Questions on Biodiesel Vehicle Issues
Definitions of Bio-Based Diesel Fuels
Biodiesel: Biodiesel is chemically referred to Fatty Acid Methyl Ester (FAME). It is produced from raw vegetable oil or animal fat and methanol. Biodiesel is chemically distinct from petroleum diesel and bears quality risks, depending on feedstock (fuel ageing, cold flow), given physical properties (fuel evaporation), and accuracy of production process (contaminations). Therefore, the use of biodiesel can have technical implications upon the operation of the engine/fuel system.
Renewable Diesel Fuels: Non-biodiesel fuels. Produced from different biological materials through various production processes:
Renewable Diesel: A paraffinic fuel with high quality produced from vegetable oil or animal fat by hydro treatment.
Biomass-to-Liquid = Sun Diesel (BTL): A paraffinic fuel with high quality produced from biomass (e.g. waste biomass) which is converted through high-temperature gasification into a synthetic gas, which is then transferred by Fischer-Tropsch process to the liquid fuel.
Vegetable Oil: Non-biodiesel fuel. Unprocessed vegetable oil extracted from plants is not suitable as fuel for on-road diesel vehicles due to it’s low cetane number <40, high viscosity, and coking behavior.
Main Quality Characteristics of Straight Biodiesel (B100 / 100%)
Fatty Acid Methyl Ester content:
Describes the purity of biodiesel and is not regulated in the USA.
Biodiesel tends to oxidize more rapidly than diesel by forming acids and polymers. The oxidation
stability depends on the feedstock used. Soybean Methyl Ester (SME) which is mainly used in the United States has a lower oxidation stability compared to that of biodiesel from other feedstocks.
Due to production shortcomings there are possibilities for the contamination of biodiesel with a lot of harmful byproducts. There are distributors/retailers selling biodiesel blended diesel that are not certified for the quality of their product and production processes.
Higher biodiesel blending increases the possible negative effects of the above mentioned quality deficiencies and possible damage to the engine/fuel system. Mercedes-Benz/Daimler Approval Concerning Biodiesel.
Mercedes-Benz/Daimler Approval Concerning Biodiesel
Mercedes-Benz approves the use of B5 according to ASTM D975 (standard Ultra Low Sulphur Diesel (ULSD) with a maximum of up to 5 % biodiesel) in all Common Rail Injection (CDI) and BlueTEC diesel engines
The only approved processed biodiesel for B5 blending is one that meets ASTM D975 specification to prevent damage to the engine system from deposits and / or corrosion.
Diesel fuels containing a higher percentage of biodiesel, (e.g. B6 to B20) according to ASTM D7467 as well as straight biodiesel (B100 / 100%) ASTM D6751 may cause severe damage to your engine/fuel system and are not approved.
Labeling of approved fuels.
Attention! Any percentage of homebrewed biodiesel does not meet Mercedes-Benz approved fuel standards and is not approved!
Frequently Asked Questions on Biodiesel Fuel Issues
- Fuel Regulations in the USA Concerning Biodiesel
- Home Brewed Versus Commercially Produced Biodiesel
- Technical Risks of Diesel Fuel Containing Biodiesel
Fuel Regulations in the USA Concerning Biodiesel
Regular ultra low sulfur diesel (ULSD) acc. to ASTM D975 might contain biodiesel up to 5 % v/v.
Recently another specification for an ULSD with a biodiesel content of 5.5 to 20 %v/v = B20 was passed.
Biodiesel which is used for blending or as straight biodiesel (B100 / 100%) has to fulfill the ASTM D6751. The requirement for aging stability is not sufficiently regulated. B100 itself is not suitable for DPF applications
It is up to the individual US states to adopt the ASTM
Due to quality deficiencies B20 and B100 are not suitable for passenger car and light duty truck applications of Mercedes-Benz equipped with diesel particulate traps.
Home Brewed versus Commercially Produced Biodiesel
For home brewing, the production process cannot be controlled in an adequate manner concerning completeness of reaction, conditioning, processing and cleaning necessities.
A qualified production process and also biodiesel blending would require a complete analytical fuel laboratory, which home brew producers would most likely not invest in. This may lead to fuels not meeting ASTM specifications.
Private fuel storage facilities may not be suitable.
Fuels which do not meet the ASTM specifications are NOT approved by Mercedes Benz and the Mercedes-Benz Limited Warranty does not cover damages caused by the use of fuels that do not meet Mercedes-Benz approved fuel standards !
Frequently Asked Questions on Biodiesel Vehicle Issues
- Technical Risks of Diesel Fuel Containing Biodiesel
- Further Impacts of Biodiesel on Vehicle Characteristics
- Recommendations for a Vehicle With Extended Standstill Period Which Use Diesel Fuel Containing Biodiesel for Periods> 4Weeks
- Warranty Guidelines for Biodiesel Usage
Technical Risks of Diesel Fuel Containing Biodiesel
Clogging of fuel filter caused by
a) soaps, which may be formed by biodiesel components (aging products and contaminants)
b) microbes, which may contaminate biodiesel blends.
Fuel gelling under cold climate conditions, e.g. additives of biodiesel and conventional diesel are sometimes incompatible.
Sticking /corrosion of high pressure pump parts / injectors especially after a longer stand-still period of the vehicle due to aging products of biodiesel (sticky polymers, acids).
Nozzle coking / and injector deposits accelerated through by-products of biodiesel.
Deposit formation on piston rings and also on lambda sensors, exhaust gas recirculation system parts.
Further Impacts of Biodiesel on Vehicle Characteristics
Impact of Biodiesel on Engine Noise
There is no negative impact on noise, vibration, or harshness when using approved biodiesel containing ULSD (B5)
Burning Properties of Diesel Fuel Containing Biodiesel (Emissions)
There is no change in the level of regulated emissions when using approved biodiesel blended ULSD (B5)
Exhaust Smell When Using Diesel Fuel Containing Biodiesel
The use of B5 will not result in a different smell.
B100 exhaust has a different smell than that of diesel exhaust. (smells like French fry oil). For diesel containing biodiesel, smell depends on blending rate.
Fuel Consumption and Engine Power Comparison (Diesel vs. Biodiesel Blended Diesel)
Biodiesel containing up to B5 will have no difference in terms of power and fuel economy notable when compared to normal diesel.
Biodiesel > B5 has a lower energy content than diesel fuel which results in a slight power loss and a slightly increased fuel consumption.
Recommendations for a Vehicle With Extended Standstill Periods Which Use Diesel Fuel Containing Biodiesel for Periods > 4 Weeks
The vehicle should not be parked in the sun, higher temperature will cause quicker biodiesel aging and can lead to the formation of corrosive acids and sticky polymers.
Warranty Guidelines for Biodiesel Usage
Refer to the appropriate owner, maintenance manuals for your vehicle.
All diesel fuels containing greater than B5 biodiesel as well as straight biodiesel (B100 / 100%)
are not approved by Mercedes-Benz as the risk for severe engine damage is increased. Any damages caused by the use of such non-approved fuels will not be covered by the Mercedes-Benz Limited Warranty.
Vehicle Modifications for Biodiesel Usage
No modification kit is necessary for up to B5 Biodiesel content.
Biodiesel content greater than B5 is NOT approved for Mercedes-Benz vehicles, hence no approved modification kit is available.
- 【2023 Newest OBD2 Scanner Diagnostic Tool】NC610 car scan diagnostic tool adopts new smart chip and latest user interface design, which perfectly combines OBDII 16-pin and 9-pin (gasoline and diesel). This OBD2 car code reader can easily determine why the check engine light is on, quickly read and erase diagnostic trouble codes, freeze frames, I/M monitor ready status, battery test, smoke test, fuel test, trouble code query library (50000+), read data stream and data playback function.
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- 【Instructions】: There are 6 buttons on OBD2 Scanner: scroll up/down, enter/exit and buttons that quick query VIN vehicle number& the DTC fault code. If you have any product problems or installation problems, please feel free to contact us, we promise to always provide satisfactory solutions and serve you.
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- 【Worldwide Compatibility 】CDE900 code scanner works on most OBD-II compliant vehicles after 1996 and upgrade new make up to 2023 models, compatible with OBD2/EOBD & CAN protocols, including most 12v cars, SUV, pickup, light duty truck, minivans.
- [Accurate and Fast] The obd2 scanner diagnostic tool can help you or your mechanic understand whether your car is in good condition, provide extremely accurate and fast results, and read and clear the engine fault code within a few seconds.
- [Compact Design] The car diagnostic scanner is equipped with a 2.5-foot long cable made of very thick flexible insulator. There are six buttons on the OBD2 scanner: scroll up/down, enter/exit, and quickly query the VIN vehicle number and DTC fault code.
- [Plug and Play] The vehicle inspection engine code reader is designed with a clear LCD screen (128 x 64 pixels), which is powered directly by the vehicle without any battery or charger. Even beginners can master and use the vehicle code scanner skillfully. There is no need to download the APP. It is convenient to use, which is very friendly for beginners.
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- [Extensive Functions] The auto engine fault code reader supports 9 protocols compatible with most of the 1996 U.S., 2000 European Union and Asian cars, as well as the updated OBD II and CAN domestic or imported vehicles. Support 6 languages - English, German, Dutch, Spanish, French, Italian.
Last update on 2023-11-09 / Affiliate links / Images from Amazon Product Advertising API
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