Learn about API’s DEF Certification Program, designed to ensure quality and emissions compliance. Find licensed products or apply for certification today.

he risk of contamination from airborne particles. DO employ dedicated dispensing equipment for DEF. Avoid using common funnels, pitchers or hoses used for other fluids to prevent contamination. DO …

Using high quality Diesel Exhaust Fluid (DEF) for your diesel engine is critical to preserving the emissions control systems and maximizing the efficiency of your vehicle.

El Programa de Certificación de DEF del API es un programa voluntario diseñado para certificar y monitorear las características de calidad del fluido de escape diésel destinado para el uso en …

The API Diesel Exhaust Fluid Certification Mark (API DEF Mark) is designed to identify diesel exhaust fluid intended to operate converters with selective catalytic reduction (SCR) in motor vehicles with …

Begin your DEF license application with API. Follow detailed steps, upload documentation, and review fees. Get certified to show DEF quality—apply now!

This document provides an overview of the program and explanation of the requirements to become an API-licensed diesel exhaust fluid marketer and use the API DEF Certification Marks.

为了使 SCR 设备正常工作，DEF 必须满足严格的纯度标准。 此标准由国际标准化组织 (ISO) 发布，旨在确保配备了 SCR 的汽车和卡车所用的柴油机尾气处理液达到柴油机制造商要求的纯度，并保证排放 …

Click the link above to be redirected to the online DEF Directory of Licensees where you can search all active licensees and all their licensed products.

This document provides an overview of the program and explanation of the requirements to become an API-licensed diesel exhaust fluid marketer and use the API DEF Certification Marks.