PEAK BlueDEF Diesel Exhaust Fluid 2.5 Gallon Jug — ISO 22241 Compliant, Ready-to-Use DEF

PEAK BlueDEF 2.5 gallon jug is a ready-to-use diesel exhaust fluid (67.5% purified water, 32.5% ultra-pure urea) formulated for Selective Catalytic Reduction (SCR) systems.

PEAK BlueDEF supplies the precise urea and deionized water blend required by modern diesel engines that rely on SCR aftertreatment to reduce nitrogen oxides (NOx) in exhaust. Sold in a convenient 2.5 gallon container, this DEF is colorless, odorless and manufactured to meet ISO 22241 purity and composition standards. It is not a fuel or fuel additive — instead it is dosed into the exhaust stream where it assists the catalyst in converting pollutants into harmless nitrogen and water vapor.

How do I use PEAK BlueDEF in my diesel vehicle?

Add PEAK BlueDEF to the dedicated DEF tank only; never pour into the diesel fuel tank. Most vehicles have a clearly marked fill port near the fuel cap or in the engine bay. Use a clean funnel or dispensing pump to avoid contamination, and replace the cap securely after filling.

• Check owner’s manual for DEF tank location and instructions
• Fill only into the DEF filler to prevent damage to emission systems
• Use a funnel or pump to reduce spillage and contamination risk
• Store the jug upright and reseal after each use

What storage and handling practices keep DEF effective?

DEF is temperature-sensitive and should be stored in a cool, dry place out of direct sunlight. Freezing does not harm the chemical balance, but thaw slowly at room temperature before use; repeated exposure to extreme heat or direct sun can degrade quality. Keep containers sealed to prevent dust, dirt or other contaminants from entering the fluid.

• Store between recommended temperatures on the label to preserve shelf life
• Avoid long exposure to UV light and high heat
• Do not mix with other fluids — contamination voids specifications
• Dispose of empty jugs according to local recycling rules

Will PEAK BlueDEF affect my engine performance or warranty?

DEF does not contact fuel or engine oils and therefore does not change fuel combustion or engine power. Correct use of DEF keeps the SCR system functioning as designed and helps the vehicle comply with emissions regulations. Using ISO-compliant DEF like PEAK BlueDEF supports manufacturer requirements and can help avoid aftertreatment system faults caused by poor-quality fluids.

• Use only in the SCR/DEF reservoir — not in fuel systems
• ISO 22241 compliance helps meet manufacturer specifications
• Proper DEF reduces the risk of SCR-related warnings or reduced performance
• Keep receipts and product info if warranty questions arise

How much DEF will I need and how often should I refill?

DEF consumption varies by vehicle, load, and driving conditions but typically runs roughly 2–5% of diesel fuel usage by volume. For many light- and medium-duty trucks, a 2.5 gallon jug provides multiple fill-ups or extended range between service intervals. Monitor the vehicle’s DEF level indicator and refill before hitting low-level warnings to avoid operating restrictions.

• Typical consumption: about 2–5% of diesel fuel use
• Check dash indicator for remaining DEF and refill proactively
• Keep a spare jug for long trips or heavy-duty work cycles
• One 2.5 gallon container is convenient for occasional top-ups

Who is this for: PEAK BlueDEF 2.5 gallon jug is aimed at diesel truck and equipment owners, fleet managers, and service shops that need an ISO-compliant, ready-to-use DEF supply. It suits operators who want a trusted, easy-to-store container for routine refills of SCR-equipped vehicles — especially those looking for a compact, portable option for field service, work sites, or personal trucks.