{"product_id":"prime-guard-diesel-exhaust-fluid-def-1-gallon-ultrapure-iso-22241-api-certified","title":"Prime Guard Diesel Exhaust Fluid (DEF) 1 Gallon — ULTRAPURE, ISO 22241 \u0026 API Certified","description":"\u003cp\u003e\u003cstrong\u003ePrime Guard PRIM00203 ULTRAPURE Diesel Exhaust Fluid (1 gallon) is a high-purity, ISO-compliant DEF formulated for diesel engines with Selective Catalytic Reduction (SCR) systems to support emissions control and reliable operation.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eKeeping an SCR-equipped diesel vehicle running cleanly depends on using a DEF that matches strict purity and concentration requirements. Prime Guard’s ULTRAPURE DEF is blended to meet ISO 22241, AUS 32 and DIN 70070 standards and carries API certification, giving technicians and drivers confidence it will work with onboard dosing systems without introducing contaminants that can harm injectors, pumps, or catalysts.\u003c\/p\u003e\n\n\u003ch3\u003eHow does Prime Guard ULTRAPURE DEF fit into my vehicle’s emissions system?\u003c\/h3\u003e\n\u003cp\u003eDEF is a non-flammable aqueous solution of urea used by SCR systems to convert NOx emissions into harmless nitrogen and water vapor. Prime Guard’s formulation is ultrapure and formaldehyde-free, designed to feed safely through dosing pumps and injectors for predictable reductant delivery.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePrecisely blended to 32.5% automotive-grade urea in deionized water\u003c\/li\u003e\n  \u003cli\u003eMeets ISO 22241 and related regional standards for purity\u003c\/li\u003e\n  \u003cli\u003eAPI certified to support proper SCR performance and compatibility\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill using this DEF affect fuel economy or maintenance?\u003c\/h3\u003e\n\u003cp\u003eDEF itself doesn’t burn in the engine, but it enables the SCR system to reduce NOx efficiently, which helps the engine run closer to its optimal combustion settings. That can translate to stable fuel economy and potentially lower maintenance costs by avoiding SCR-related component contamination.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHelps maintain SCR efficiency so engine calibration stays optimized\u003c\/li\u003e\n  \u003cli\u003eUltrapure ingredients reduce risk of deposits and sensor fouling\u003c\/li\u003e\n  \u003cli\u003eAPI certification reduces uncertainty about long-term compatibility\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow should I store and handle a 1-gallon container of Prime Guard DEF?\u003c\/h3\u003e\n\u003cp\u003eStore DEF in a cool, dry, shaded area away from direct sunlight and temperatures below -11°C (12°F) to avoid freezing. Use clean pouring tools and avoid cross-contamination with fuels, oils, or other chemicals to preserve product integrity.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eKeep sealed when not in use to prevent airborne contamination\u003c\/li\u003e\n  \u003cli\u003eAvoid long exposure to heat or sunlight to maintain stability\u003c\/li\u003e\n  \u003cli\u003eIf frozen, thaw slowly at room temperature before use—do not heat\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow can I tell this DEF is the right quality and concentration?\u003c\/h3\u003e\n\u003cp\u003ePrime Guard ULTRAPURE DEF is manufactured and tested to meet international standards for urea concentration and impurity limits. Look for ISO 22241 compliance and API certification on the label as confirmation the product matches the specifications required by SCR system manufacturers.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e32.5% urea concentration for consistent dosing accuracy\u003c\/li\u003e\n  \u003cli\u003eMeets ISO 22241, AUS 32, and DIN 70070 purity criteria\u003c\/li\u003e\n  \u003cli\u003eAPI certification indicates quality controls and testing procedures\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Prime Guard PRIM00203 ULTRAPURE DEF (1 gallon) is intended for owners and fleet managers of light- to heavy-duty diesel vehicles equipped with SCR systems who want a dependable, standards-compliant DEF in a convenient size. It’s suitable for technicians topping off onboard tanks, drivers carrying spare fluid for long routes, and service departments that require consistent product quality. Avoid using DEF that is contaminated or of uncertain origin; using a certified, ultrapure solution helps maintain SCR system reliability and reduces the risk of costly repairs related to improper reductant.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is Prime Guard DEF safe for my SCR system?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It’s formulated to ISO 22241 and API standards to avoid contaminants that can damage SCR components.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I store a 1-gallon container long-term?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Store sealed in a cool, shaded place; avoid freezing and contamination. Shelf life varies by storage conditions.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Prime Guard","offers":[{"title":"Default Title","offer_id":55164058665303,"sku":"B08H6VW68C","price":54.88,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/prime-guard-prim00203-front-label.jpg?v=1790349488","url":"https:\/\/britishgarage.co.uk\/products\/prime-guard-diesel-exhaust-fluid-def-1-gallon-ultrapure-iso-22241-api-certified","provider":"British Garage","version":"1.0","type":"link"}