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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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