Why You Need Diesel Exhaust Fluid Solutions

Diesel Exhaust Fluid (DEF) has become a necessity to run your medium and heavy-duty diesel vehicles. Luckily, we have multiple options to get you the high-quality DEF you need exactly when and where you your need it.

In 2010 the US Environmental Protection Agency (EPA) set emissions standards to reduce significantly reduce the engine emissions in medium and heavy-duty vehicles. This has resulted in a Selective Catalytic Reduction (SCR) system that utilizes DEF to remove harmful NOx emissions from diesel engines.

“Thanks to Ramos Oil I never have to worry about our DEF needs! They always make sure our containers never run dry, so our truck can keep working.”

David S.

Fleet Manager

Diesel Exhaust Fluid (DEF) When and Where You Need it

Let us take the responsibility of making sure your fleet of vehicles has the DEF they need to operate at full capacity. When you partner with Ramos Oil you can rest assured we deliver the highest quality DEF on the market, guaranteed to be free from impurities, and keeps your vehicle’s catalyst safe from harm.

We understand the difficulties in managing a diverse fleet of diesel vehicles requires access to products when and where you need them. To provide your business with the DEF you need, we have three convenient options to meet your needs.

DEF Storage Tank

Bulk DEF Delivery

Let our fleet of reliable delivery truck deliver DEF directly to your facility or job site. If needed, we can provide Equipment Sales & Loan Solutions for permanent or temporary storage of your bulk DEF.

Fleet Fueling with DEF

You don’t need to store your own fuel or DEF but can still enjoy the peace of mind your team is ready to roll every day. Our Fleet Fueling Service brings the fuel and DEF you need directly to your vehicles.

Cardlock Fueling Solutions with DEF

When your fleet is constantly on the move you need fuel and DEF across California and the country. With a Ramos Oil Cardlock Fueling Solution, your fleet can rest assured they will always have 24/7 convenient access to the fuel and DEF they need no matter where they are.

Our DEF Brands

Logo for Blue Sky: Diesel Exhaust Fluid

DEF Packaging Options

  • Bulk Delivery or Pickup
  • 275 & 330 Gallon Totes
  • 55 Gallon Drums
  • 1 & 2.5 Gallon Containers

Learn How You Can Save Time & Money with Our Bulk DEF Solutions!

Diesel Exhaust Fluid (DEF) FAQs

What is DEF?

DEF is the Fluid (known as Diesel Exhaust Fluid) that is used in Selective Catalytic Reduction (SCR) systems on diesel engines to reduce NOx.

What is Selective Catalytic Reduction (SCR)?

SCR is an acronym for Selective Catalytic Reduction. SCR is a technology that uses a urea-based diesel exhaust fluid (DEF) and a catalytic converter to significantly reduce oxides of nitrogen (NOx) emissions. SCR is being used by almost all OEM manufacturers.

How does an SCR System work?

The purpose of the SCR system is to reduce levels of NOx (oxides of nitrogen emitted from engines) that are harmful to our health and the environment. SCR is the after-treatment technology that treats exhaust gas downstream of the engine.

Small quantities of diesel exhaust fluid (DEF) are injected into the exhaust upstream of a catalyst, where it vaporizes and decomposes to form ammonia and carbon dioxide. The ammonia (NH3) is the desired product which in conjunction to the SCR catalyst, converts the NOx to harmless nitrogen (N2) and water (H2O).

What is DEF for?

When used in an SCR system DEF will reduce the levels of NOx emissions of those engines.

What is the composition of DEF?

When used in an SCR system DEF will reduce the levels of NOx emissions of those engines.

What is Urea?

Urea is a compound of nitrogen whose aqueous solution generates ammonia when heated. It is used in a variety of industries, including as a fertilizer in agriculture.

Why use a 32.5% urea solution?

The 32.5% urea concentration is the lowest freezing point for water urea solutions. Thus, the SCR systems will be calibrated to the 32.5% solution, so that optimum NOx will be reduced during operation.

What is the freeze point of DEF?

A 32.5% solution of DEF will begin to crystallize and freeze at 12 °F (-11 °C). Freezing does not harm the quality of the DEF solution. Upon thawing, DEF will perform as required.

How do I keep the DEF from freezing? What happens if the DEF freezes in the tank on the vehicle?

During vehicle operation, SCR systems are designed to provide heating for the DEF tank and supply lines. If DEF freezes when the vehicle is shut down, start up and normal operation of the vehicle will not be inhibited. The SCR heating system is designed to quickly return the DEF to liquid form and the operation of the vehicle will not be affected.

Does DEF expand when frozen?

Yes, DEF expands by approximately 7% when frozen. DEF packaging and tanks are designed to allow for expansion.

Are there any quality standards the DEF must meet?

Yes, DEF needs to meet the ISO 22241 quality standard.

Is it hazardous, toxic or flammable?

No, DEF is classified as non hazardous, non toxic or flammable.

Is DEF corrosive?

DEF is corrosive to copper and brass as well as other materials. Only approved materials as listed in the ISO 22241 standards should be used in contact with DEF.

Why is the SCR system, requiring DEF being incorporated into diesel vehicles?

The EPA has mandated the reduction of NOx emissions released into the environment. In particular, the new 2010 requirements

What happens if the vehicle runs out of DEF?

Vehicles will be equipped with a DEF gauge on the dash to alert the driver on the _uid level. If the level becomes low an alert will let the driver know the DEF level needs to be replenished. If the driver runs out completely the vehicle power will be reduced to encourage the operator to refill the DEF tank. Once the DEF tank is refilled, normal power levels will be restored on the vehicle.

Does DEF mix with fuel?

No, it is not an additive. It is sprayed into the exhaust stream where it reacts with the NOx in the SCR system to form Nitrogen and Water.

How much DEF will I need?

DEF is consumed at a rate of approximately 2-3% by volume to diesel consumption.

Whether you need DEF delivered direct to your fleet, your onsite storage tanks, give each vehicle its own access on the go, or a combination of solutions Ramos Oil has you covered. Contact our friendly sales team today to get started on a customized DEF strategy for you.