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Your cart is empty.RISLONE® DEF CRYSTAL CLEANTM Diesel DEF & SCR Emissions System Cleaner is a propriety blend of DEF (Diesel Exhaust Fluid) / AdBlue® compatible cleaning agents and surfactant detergents specifically designed to be safe to use and work on SCR (Selective Catalyst Reduction) systems. DEF Crystal Clean gives a cleaning effect on the entire SCR system by working to dissolve the white crystal deposits that form in the tank, pump, heater, sender, lines, injector, decomposition tube / reactor and mixer. These deposits can interfere with the normal operation of the SCR emissions system and engine, increasing fuel consumption and reducing engine power. This reduced power can lead to operating in limp mode where the vehicle will drive slowly, or become undrivable. This process restores function and with regular use maintains efficiency of the SCR. DO NOT ADD TO DIESEL FUEL TANK. INSTRUCTIONS: DEF Crystal Clean is specifically designed to only be installed in the Diesel Exhaust Fluid / AdBlue tank which usually has a blue cap. Do not add to the diesel fuel tank. * Light Truck or Mid-Size to Large SUV - 5 to 9 gallon tank capacity install full bottle into DEF tank. *Car or Small SUV - 3 to 5 gallon tank capacity use approximately 1/2 bottle. *Medium and Heavy Duty Diesel Trucks - 10 to 20 gallon tank capacity use 2 bottles. Pour DEF Crystal Clean into mostly full DEF tank or add and fill tank with diesel exhaust fluid. If light is still on after 250 miles or a few days of driving, second application may be required, or mechanical attention is needed. NOTE: Works with all approved diesel exhaust fluids. Some vehicles use a special filling adapter to install DEF / AdBlue into the tank. For those vehicles use special funnel or pour into mostly empty DEF / AdBlue bottle and install in system.
Gregory K. Whittaker
Reviewed in the United States on March 2, 2025
Great
Customer
Reviewed in the United States on February 13, 2025
Wish I had found it earlier. Works good
Brittney Withers
Reviewed in the United States on January 31, 2025
I added a dose of this to my tank as a preventive measure to keep everything in good working order. Never had a problem with anything prior to using this stuff. The "Poor DEF quality" warning light was displayed soon after i added this to my tank. After running the truck until DEF was around 1/2 tank, I topped the tank off with DEF and the warning light went away on its own and I haven't seen it since. I never noticed any actual problems but my Duramax L5P didn't like it. It could have been the DEF that I added when I added the product--i have no way of knowing. I've always bought Peak BlueDEF and never had a problem except when i mixed it with this.
Customer
Reviewed in the United States on September 28, 2024
Excellant product. I highly recommend it.Instead of my truck telling me I needed DEF fluid it threw a code and immediately started to count down to miles left before a reduction in speed. Then I remembered I is DEF that was old. When I looked online I found a YouTube video explaining this product. I put a half bottle dose into the 5.5 gallon DEF tank in my 2016 GMC Canyon and within a day the engine light went off and I was back to normal. I put the second half of bottle in the next DEF fill up. Since then I ran NJ to Florida twice with no issues.
Hairy
Reviewed in the United States on December 26, 2024
Cleans DEF system
James R Downs
Reviewed in the United States on December 11, 2024
Bought to remove crystals from a DEF system with a heater trouble code. 2013 X5 35D - research indicated the heater code is created when crystals build up on the heater and I attempted to use this to remove them. 600 miles later and the code comes back as soon as you clear it. Might work for other issues but not for this one.
LvDavis
Reviewed in the United States on December 1, 2024
Kept having DEF related issues and cleaned up my tank/system quickly. L9ve how the bottle was designed to pour in the tank without a fuel. Will be buying again.
George Tiffany
Reviewed in the United States on October 14, 2024
Got the dreaded “limp mode” message on my Ram diesel. Tried this product 1st. Did not make a difference in 100 miles. Turned out to be a bad coil on the DEF injector, which cannot be fixed with this product. Rislone is a good product, but not for use in this case.
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