Keller-Heartt Oil Blog

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Diesel Exhaust Fluid

Troubleshooting Common DEF Issues in Trucks

Troubleshoot common Diesel Exhaust Fluid (DEF) issues in trucks, learn best practices for maintenance, and ensure your fleet runs smoothly and...

Oil

Synthetic Oils: Are They Worth the Extra Cost?

Find out if synthetic oils are worth the cost by examining benefits, performance, protection, and longevity. Learn what's best for your vehicle.

Oil

Synthetic vs. Mineral Oil

Learn the differences between synthetic and mineral oil to make an informed decision for your vehicle. Explore the pros and cons to choose the right...