Buying effectively comes down to two main factors: freshness and compliance with ISO 22241 standards. Because the formula is federally regulated (32.5% high-purity urea and 67.5% deionized water), "premium" brands often offer the same basic chemistry as budget options. ⛽ Where to Buy DEF
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DEF has a shelf life of roughly 1–2 years depending on temperature. Avoid jugs that have been sitting in the sun or are older than 6 months for maximum reliability. Buying effectively comes down to two main factors:
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