New Diesel Exhaust Fluid Additive Hits Market
Owners of diesel trucks can use this new additive to prevent crystallization buildup in emissions systems.
Updated on Oct. 16, 2026 in Trucks
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Hot Shot's Secret has introduced Premium DEFender, a diesel exhaust fluid (DEF) additive designed to minimize crystallization in emissions systems. The product aims to prevent common mechanical issues for owners of diesel engines equipped with selective catalytic reduction technology.
Why it matters
Crystallization buildup within fluid lines and injectors often triggers costly vehicle fault codes and performance derates. This additive is formulated to clear these deposits, helping maintain proper fluid spray patterns and avoid unexpected downtime.
The new additive treats 40 gallons of fluid per 16-ounce bottle. The recommended dosage for diesel exhaust fluid systems is 1 ounce for every 2.5 gallons.
The players
Hot Shot's Secret
A manufacturer of performance-focused automotive chemicals and additives for diesel engine maintenance.
The details
Premium DEFender works by breaking down and preventing the buildup of crystals that naturally form in diesel exhaust fluid. When crystals accumulate, they can clog injectors and restrict fluid lines, forcing the vehicle into a derated state to protect the engine. By restoring proper spray patterns, the additive ensures the selective catalytic reduction system functions according to its original design.
Timeline
October 16, 2026: Product availability announced.
The Home Front
Modern diesel trucks rely on selective catalytic reduction systems to meet current emissions standards, making the health of these systems critical for operational uptime. This product launch reflects a growing market shift toward specialized aftermarket additives designed to extend the life of these complex components.
If you operate a vehicle with a diesel engine, monitor your emissions system for signs of crystallization or recurring fault codes. Before adding any chemicals to your DEF tank, consult your owner manual to ensure compatibility with your specific emissions system warranty.
The takeaway
Maintaining clean injectors is vital to avoiding performance derates that can strand a driver. Keep a record of any additives used in your maintenance log to help your mechanic diagnose potential fuel or emissions system issues in the future.
Further reading
Learn more about maintaining your vehicle's performance in our Trucks section.
Source note: This article includes information reported by FleetOwner.
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