DC101 DEF Anti-Crystal Additive & Cleaner

Modern diesel engines rely on the DEF system to stay compliant and running right, but DEF crystal buildup is one of the most common causes of warning lights, derates, and expensive repairs.

Combustion Technologies DC101 is a powerful DEF system treatment designed to keep the entire system clean, efficient, and operating the way it should. Just one bottle treats up to 20 gallons of DEF, working throughout the tank and system components to break down existing crystal buildup while helping prevent new crystals from forming.

By stopping crystal buildup before it becomes a problem, DC101 helps reduce the chances of costly downtime, derates, and DEF system failures that can leave your truck limping when you need it most.

But DC101 doesn't stop there. This advanced formula cleans and lubricates the entire DEF system, helping remove harmful sludge and bacteria that can contaminate DEF and affect performance. It also lowers the DEF freeze point by up to 17 degrees, helping improve cold-weather reliability when temperatures drop.

In addition, DC101 reduces surface tension, improving DEF return flow back to the tank and supporting smooth, consistent DEF system operation.

Features & Benefits

• Breaks down existing DEF crystal buildup
• Helps prevent new crystals from forming
• Cleans and lubricates DEF system components
• Removes harmful sludge and bacteria
• Lowers DEF freeze point by up to 17°
• Improves DEF return flow back to the tank
• Helps reduce warning lights, derates, and DEF-related issues
• Treats up to 20 gallons of DEF per bottle

Recommended Usage

For best results, treat your DEF system with DC101 once per month.

If your truck goes through DEF frequently or operates under heavy workloads, treating twice per month may provide additional protection.

Real-World Testing

The photos shown demonstrate our own testing with DC101. DEF quality readings confirmed that DC101 does not negatively affect DEF quality, while crystal formation testing clearly showed the difference between untreated DEF forming crystals and treated DEF remaining liquid.

Why Redneck Approved?

Nobody has time for a DEF warning light, especially when it decides to show up halfway through a trip, a haul, or right before a weekend you've been looking forward to.

DC101 helps keep your DEF system clean and flowing properly so you're spending more time driving and less time staring at a dashboard light that's acting like it pays the truck payment.

Redneck Logic

DEF crystals are a lot like weeds in a fence row. Ignore them long enough and they'll turn a small problem into a whole day's worth of work.

If you want to keep your DEF system clean, avoid unnecessary downtime, and stay ahead of costly repairs, DC101 is one of the easiest pieces of preventative maintenance you can add to your truck.