# What Can Happen If You Use Expired Diesel Exhaust Fluid (DEF)?

> It's no secret that diesel engines have experienced significant growth over the past two decades. Today, many manufacturers, including Subaru, Volkswagen, and Audi, are choosing diesel, as it is more efficient than…

- **Source:** [SlashGear](https://www.slashgear.com/1865545/expired-def-what-happens-explained/?utm_source=gearopen.com&utm_medium=referral&utm_campaign=feed&utm_content=683631262f1f468cc24f3e10)
- **Published:** 2025-05-27
- **Category:** Cars
- **Tags:** #volkswagen #audi #diesel #exhaust #fluid #engines #expired #happen
- **Canonical:** http://localhost:4321/a/683631262f1f468cc24f3e10

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_GearOpen's distilled summary. The full original article is published at SlashGear (source link above); GearOpen does not republish the source's full text._