Diesel fuels are inherently unstable and subject to natural deterioration caused by water, oxidation, microbial growth and chemicals, which contribute to polymerization and stratification. The result is poor fuel quality, sludge and acids that can damage engine components and degrade performance.
The process begins long before the fuel gets to your fuel tank. It has been shown that diesel fuel typically starts to deteriorate and form solids within 60–90 days after refining.
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