Diesel Exhaust Fluid (DEF) Service Tips

All 6.7L diesel equipped F-super duty vehicles are equipped with a Diesel Exhaust Fluid (DEF) system in order to aid in Nox reduction.

In many cases, DEF system concerns are related to petroleum contamination or misdiagnosis.

This General Service Bulletin is intended to aid in the diagnosis of the DEF system and help aid in determining if the system has been contaminated.

Petroleum contamination of the DEF system is non-warrantable.

See GSB: G0000012 for details.

Formulated to work with all SCR-equipped diesel engines
Safe, easy-to-handle, nontoxic solution of 67.5% water and 32.5% automotive grade urea
Certified to meet all API & ISO 22241 requirements
Compatible with AdBlue and other DEF products
DEF is a consumable and essential fluid for maintaining SCR-equipped modern diesel engines; contains 30-50ppm bitterant

Last update on 2026-06-18 / Affiliate links / Images from Amazon Product Advertising API

No products found.

ENGINEERED: For use in Selective Catalytic Reduction (SCR) systems on diesel engines
EFFICIENCY: BlueDEF diesel exhaust fluid is key to helping improve fuel economy by up to five percent
PROTECTION: Diesel exhaust fluid is non-toxic and safe to handle
QUALITY: Stable, colorless and odorless, and also meets ISO Standards 22241 for purity and composition
EFFORTLESS: Easily Inject the fluid into your exhaust stream with a specialized dosing module