Rislone 4784 DEF Crystal Clean™ Diesel DEF & SCR Emissions System Cleaner, 11.8 oz

Very satisfied with the results of the product. It did exactly what was advertised and my system is running code free now.

U just made the purchase. I have no clue whether it works or not. I’ve driven over 100 miles since pouring it in

A must for modern diesels. Works as advertized

Trustworthy brand. Been using other Risolene products in my diesel truck,and have been pleased with the results.

Why did you pick this product vs others?:I bought this in March for my 2014 Ram ecodiesel. My def tank fill sensor stopped working and the dealership wanted to charge me $4k for a new tank (buying just the $5 dollar sensor isn't an option). I put this in and bought a device to delete the check engine code so the truck wouldn't go into limp mode on me. So yesterday (6-25-25) about 3 months later, the gauge just shot up off the spot it had been stuck. Apparently I was right and there was a crystalized buildup on the sensor. I would recommend anyone with the issue try this before you drop the money for a new tank 👍

On the fence honestly.. I have 21’ Sierra 2500. I can’t remember when my Def gauge wasn’t acting stupid.. Probably worth it to at least try. My gauge is full.. half.. 3/4.. half.. then 1/3 after about every drive. Home and next day reading full. I assume this is at least keeping me from limp..

DO NOT ADD. I bought it to clean my after treatment system because i had a code where it said o had possibly put bad DEF in the tank. Reading up online that crystals might form in the SCR, i found this product. Hoping that it would clean up the system, as it states, it actually contaminated my after treatment system and melted (YES! MELTED) my DOC and SCR and ruined my DPF. (See pics). Dont cheap out just buy better quality DEF. Its cheaper that replacing these after treatment parts.

Used it, couldn't tell any difference but maybe that's because mine wasn't that bad. Didn't improve anything, Didn't make anything worse.