Top Tier Detergent Gasoline and Top Tier Diesel Fuel are performance specifications and trademarks designed and supported by several major automakers — BMW, General Motors, Fiat Chrysler Automobiles, Ford, Honda, Toyota, Volkswagen, Mercedes-Benz, and Audi (as of 2018). Each of these automakers recommends the use of Top Tier Detergent Gasoline in their owner's manuals. Top Tier fuels must maintain levels of detergent additives that result in a higher standard of engine cleanliness and performance as compared to the United States Environmental Protection Agency (EPA) requirement. In addition, Top Tier fuels may not contain metallic additives, which can harm the vehicle emission system and create pollutants. As of 2018, Top Tier Detergent Gasoline is available from 75 licensed retail brands.
Licensed Top Tier fuel retailers use a higher level of detergent additives compared to other non Top Tier retailers using only the minimum EPA required detergent additives in order to help prevent the buildup of harmful engine deposits which may reduce fuel economy and optimal engine performance. According to an automotive industry spokesman, the regular use of this type of gasoline results in improved engine life.[1]
The Top Tier standards must apply to all grades of gasoline or diesel that a company sells, whether it is economy (low-octane) or premium (high-octane).[2]
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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