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MAINTAIN WINTERFIT in a 1L container is a high-performance, super anti-freeze concentrate additive designed for diesel fuels and light heating oils (EL). It is specifically engineered to prevent paraffin crystal separation and filter clogging during cold weather conditions. The additive burns cleanly without leaving any residues or deposits in the combustion chamber. It does not affect the fuel cetane number, viscosity, or flammability hazard class, ensuring safe and normal fuel pump operation. Depending on the dosage ratio (typically 1:1000 up to 4:1000), it effectively lowers the cold filter plugging point (CFPP) of diesel fuels by an additional $5^\circ\text{C}$ to $10^\circ\text{C}$. It is fully miscible and compatible with all standard diesel fuels (except biodiesel) and heating oils. For optimal mixing results, the additive should be applied at temperatures above $+5^\circ\text{C}$ and mixed into the fuel tank before the first frost occurs. The 1L packaging format is convenient for routine vehicle maintenance, fleet management, and smaller fuel storage applications.