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🛠️ Keep your diesel running clean, powerful, and worry-free—because your ride deserves the best.
Rislone 4784 Crystal Clean Diesel DEF & SCR Emission System Cleaner is a specialized liquid treatment designed to dissolve crystallization deposits in diesel SCR systems. Compatible with all DEF fluids, it restores system efficiency, prevents power loss, and maintains emissions compliance without voiding vehicle warranties. Ideal for diesel vehicles prone to SCR buildup, it should be added directly to the DEF tank every 5,000 miles for optimal performance.
| Asin | B0CRSY78LR |
| Best Sellers Rank | #4,009 in Automotive (See Top 100 in Automotive) #15 in Fuel System Cleaners |
| Brand Name | Rislone |
| Customer Reviews | 4.6 4.6 out of 5 stars (585) 4.6 out of 5 stars |
| Included Components | (1) DEF and SCR Treatment |
| Item Form | Liquid |
| Item Highlight | Improves DEF Diesel Exhaust Fluid, Restores SCR Selective Catalyst Reduction, Cleans DEF Injector & Sender, 11.8 oz |
| Item Type Name | Diesel DEF & SCR Emissions System Cleaner |
| Item Volume | 11.8 fluid ounces |
| Manufacturer | Bar's Products |
| Material Features | Scented |
| Model Number | 4784 |
| Number Of Items | 1 |
| Part Number | 4784 |
| Scent | Unique |
| Size | 11.8 Fl Oz (Pack of 1) |
| Special Features | Automotive |
| Specific Uses For Product | Automotive DEF additive |
| Surface Recommendation | Automotive |
| Unit Count | 11.8 Fluid Ounces |
| Upc | 078615047840 |
| Warranty Description | Please see manufacturer |
User
Works on 2017 6.6 Duramax DEF system to keep crystallization down
2017 6.6 Duramax kept throwing a DEF code. I think it was due to crystallization on my sensors. I poured this golden nugget into my system and the codes went away and have not returned. I buy Walmart DEF for reference. I’m about to pour my 2nd round in since it’s been about 6k miles since my last dose. Highly recommend.
User
Works! Cleared code P2002
My check engine light was on and I had a P2002 code. I added Rislone 4784 Crystal Clean Diesel DEF & SCR Emission System Cleaner and some fresh DEF. After driving about 200 miles, the code cleared itself. I think the issue was that my DEF had crystalized and needed to dissolved with this cleaner. Rislone also makes a DEF additive to prevent crystallization. (Rislone Diesel DEF Treatment) I'll be adding that to my DEF tank from now on.
User
It works excellent.
As always, I'm skeptical when it comes to product performance—but this one? Amazing.I never owned a diesel until I bought my '21 GMC HD2500 Duramax. I love it, but man, diesel engines demand preventive maintenance. You can't wait for things to break—you’ve got to stay ahead of it with products that help reduce or even prevent issues.This particular product is excellent.Since the day I bought my truck, I’ve had nonstop problems with the DEF tank sensors sticking. Sometimes it would show full when I knew it wasn’t, and other times it claimed to be half empty right after a fresh fill-up. Totally unreliable.And what did the dealer say? “It’s inadvertent.” That word should be banned—it’s just an excuse to ignore a real problem.Let me tell you—this product works. Period. And it worked fast, too. Absolutely amazing.
User
A Product that actually works.
It actually worked. Very happy with the results.
User
No deg issues
Worked great no more def problems
User
Just added to def time will tell
Seems to work
User
Worth the try for the price
Worth the try.I own a 2015 Volkswagen Golf sportwagen TDI.I would always have a check engine light with a P204F00 code for Reductant System Performance Bank 1. After taking it to the dealership and a bunch of replacement parts I still had the P204F00. At this point everything dealing with emissions was pretty much replaced.I saw this product and figured id try to clean the DEF fluid. I had about half a tank of DEF in the tank, poured half the bottle in and let it sit for 8hrs. Topped off DEF with new fluid. Took it for a hour and a half drive forcing it to regen. Got home and let it sit. Next morning the code and check engine light was gone. It’s been about 3000 miles since the cleaner was added and the codes haven’t came back. Well worth the try.
User
Review of Rislone DEF Crystals Cleaner
As a first time user of Rislone product, I’ve been pretty much satisfied with it. We’ve had our ‘015 F-350 series nice it was new and with nearly 200,000 miles, have noticed the residual left-over DEF crystals both in the containers & around the truck’s feed cap. Although never had any known symptoms from the DEF crystals (other than maybe when replacing the DEF heater & a couple exhaust sensors), this additive should rid the truck!s DEF system of those crystals.
Trustpilot
3 weeks ago
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