---
title: Keller-Heartt News Blog | BlueDEF
description: BlueDEF | Keller-Heartt is the leading online distributor of oils, lubricants, grease, and chemicals for Industrial, Automotive, and Trucking. Free shipping - all orders!
---

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# Keller-Heartt Oil Blog

### Keller-Heartt is the leading online distributor of oils, lubricants, grease, and chemicals for Industrial, Automotive, and Trucking. Free shipping - all orders!

### Subscribe to Our Blog!

<https://info.kellerheartt.com/blogs/what-is-def-crystallization>

BlueDEF

### [DEF Crystallization Explained: Causes, SCR Damage, and How Fleets Can Prevent It](https://info.kellerheartt.com/blogs/what-is-def-crystallization)

Crystallized DEF is one of the leading causes of SCR failure and downtime. Find out what causes it, how to fix it, and how to prevent it.

 Brian McGrath  Jan 19, 2026

<https://info.kellerheartt.com/blogs/better-to-be-blue-improving-diesel-engines-bluedef>

BlueDEF

### [Better to be Blue: Improving Diesel Engines With BlueDEF®](https://info.kellerheartt.com/blogs/better-to-be-blue-improving-diesel-engines-bluedef)

Not all diesel exhaust fluid is the same. Learn how to improve your diesel engine performance with BlueDEF® from Keller-Heartt Oil.

 Brian McGrath  Sep 13, 2024

<https://info.kellerheartt.com/blogs/calculating-your-def-needs-and-budget>

BlueDEF

### [Calculating Your DEF Needs and Budget](https://info.kellerheartt.com/blogs/calculating-your-def-needs-and-budget)

Learn how much DEF your fleet requires to run optimally.

 Brian McGrath  Aug 16, 2024

<https://info.kellerheartt.com/blogs/faqs-about-diesel-exhaust-fluid-storage>

BlueDEF

### [FAQs About Diesel Exhaust Fluid Storage](https://info.kellerheartt.com/blogs/faqs-about-diesel-exhaust-fluid-storage)

With the rising popularity of diesel exhaust fluid (DEF) comes ample questions about this vital automotive fluid. Read on for answers to our FAQs.

 Brian McGrath  Mar 1, 2024

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