Introduction

Given the recent reports at TMC's 2026 Annual Meeting regarding diesel exhaust fluid (DEF) contamination/misfueling with diesel, ATA's Technology & Maintenance Council is gathering information on fleets' experiences with this phenomenon in terms of frequency and related consequences.

To complete this survey, please first gather and review your fleet data on the number of cases of DEF misfueling as well as any associated repair, warranty and downtime information available.

Your input into the following survey will help TMC develop recommended practices for eventual consideration by the appropriate Council Study Groups in this area.

Please respond by April 30, 2026. You help is greatly appreciated.

Sincerely,

ATA's Technology & Maintenance Council
( Privacy & Cookie Notice

T