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As of 2006, almost all diesel fuel available in Europe and North America is of a Ultra Low Sulfur Diesel type (ULSD) The change was made to help protect our environment from the environmentally harmful sulfur content in the fuel. Much like lead was removed from gasoline. This process used to reduce the sulfur also reduces the fuel's lubricating properties. The fuel no longer has the same ability to lubricate and protect the various parts of the engine's fuel injection system from wear as it did before. ULSD fuel is also known to cause some seals to shrink and may cause fuel pump failures. What can you do?

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