I left a bottle of Stanadyne Performance Formula in my truck overnight and it froze solid, doesn’t that mean the product is defective?

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I left a bottle of Stanadyne Performance Formula in my truck overnight and it froze solid, doesn’t that mean the product is defective?

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A. No. It’s counterintuitive, but just like pure antifreeze, additive must be diluted to reduce its freezing temperature. The reason for this is a phenomenon known as “freezing point depression.” In order for a substance to freeze, the molecules of that substance must be aligned/ordered properly to form crystals. If there are impurities in the substance (e.g. additive in solution with diesel fuel) the liquid is inherently less ordered and will not crystallize (freeze) as easily. Conversely, when additive is unmixed, the molecules are uniformly distributed. This means that the additive will freeze at higher temperatures than when it is in solution with another substance.

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