New Rislone DIESEL DEFense is built around one simple idea: most diesel owners refill from a 2.5-gallon DEF cube, so we sized a bottle to match. One bottle treats one full cube – pour it in and you’re protected. No dosage chart, no measuring cup, no leftover product going to waste.
DIESEL DEFense stops hard white urea crystals from forming in the parts of your SCR and DEF system that cost the most to replace: the tank, pump, heater, sender, lines, injector and mixer. It’s serious crystal protection in a pre-measured single-cube bottle that makes treating every fill effortless.
How do I use it?
Pour the entire bottle directly into one 2.5-gallon DEF cube, or into your DEF tank after filling up. The bottle is pre-measured for one cube – there’s nothing to calculate, and no extra mess.
How is DIESEL DEFense different from Rislone’s other Diesel DEF Treatment options?
Same protection, three sizes for all kinds of drivers. Our 8 oz Diesel DEF Treatment (part #4780) is the standard value size – it treats up to 8 gallons and is dosed by the ounce, ideal if you refill often or run multiple vehicles. DIESEL DEFense (this product, #4781) is pre-measured for a single 2.5-gallon cube, so there’s no measuring at all. Buy DEF in bulk? Go with our DEF Treatment Super Concentrate size (33 oz).
How often should I use it?
Every time you refill your DEF/AdBlue® tank. Crystal protection works best as routine maintenance, not a one-time fix – one bottle per cube, every fill.
Why choose the single-cube size?
Three reasons: no measuring, no leftover product to store or spill, and it’s the lowest-cost way to add Rislone DEF protection to your routine. Keep one in the glovebox or grab one every time you pick up a cube of DEF.
Do I still need it if my DEF looks fine?
Yes – that’s exactly when it works best. Once white crystals form, they’re already restricting your SCR system. Treating clean DEF on every fill keeps deposits from forming in the first place. If you already have warning lights, limp mode or reduced power, start with Rislone DEF Crystal Clean® (part# 4784) to clear existing buildup, then maintain with DIESEL DEFense.
Main benefits:
- Pre-measured to treat one full 2.5-gallon DEF cube – no measuring needed
- Stops hard white urea crystals from forming in your SCR and DEF system
- Protects the tank, pump, heater, sender, lines, injector and mixer
- Works with all UREA / AdBlue® / DEF fluids; won’t void vehicle warranty
- Ideal for diesels driven at low speeds, light loads, short trips or frequent stops, where crystal buildup is most common
Instructions:
Pour the entire bottle directly into one 2.5-gallon DEF cube, or into the DEF tank after filling up. Only add to DEF/AdBlue® fluid – never add to diesel fuel.
AdBlue® is a registered trademark of VDA Verband der Automobilindustrie e.V.
Part Number: 4781
Dosage: Pour directly into the DEF cube or DEF tank after filling up. One bottle treats 2.5 gallons (one cube).
Size: 1.7 FL OZ (50mL)
