Cattle Ranches

Diesel Generator's

Farming and Aerial Spraying

Trucking Fleets

Drilling Rigs

Fronk Oil Co, Inc. Refined Fuels

For 69 Years Fronk Oil has been known for their dependable Service. No matter what size delivery from 200 to 8500 Gallons we can handle your needs.

All orders are delivered the next working day and some even the same day the product is ordered.


Questions often asked.

Often we have people ask about getting conventional (non Ethanol) gasoline in our area, the answer is “Yes” we can but they must be in transport quantities and the price will be higher due to the logistics.

For other lengthy topics please click on one of the toggles below.


Bio Diesel

There is still a lot of talk about biodiesel these days, mainly due to tax and environmental incentives. But what is biodiesel? Is it the same as soy-diesel or is it fuel that has been treated with a soy based additive? Just what do they mean?

Raw soybean or other vegetable oil is NOT biodiesel. Fuel grade biodiesel is made from renewable resources that have been processed in strict accordance to ASTM D-6751.

The key word in understanding this standard is the term “transesterification”. The raw vegetable oil or animal fat is reacted with an alcohol and a catalyst such as an acid. This process yields an ester and glycerin. The glycerin is removed and the ester that is left is biodiesel. Pure biodiesel is referred to as B100 (100% pure biodiesel).  Biodiesel that is made from animal fat is called “yellow” biodiesel. The difference between biodiesel that is made from animal fat and from vegetable oil is negligible. In fact there is a greater difference between biodiesel and petroleum diesel than there is between “yellow’ and “green” biodiesel. Fuel treatment additives that work in B100 will work equally well in both “yellow” and “green” biodiesel.

B100 is then blended with petroleum diesel in various concentrations. These blended fuels are then denoted as “BXX” with “XX” representing the percentage of biodiesel in the final blend. As an example B5 would mean 5% biodiesel and 95% petroleum diesel.

There are some serious drawbacks to the use and handling of biodiesel. Producers, transporters, and bulk handlers alike have difficulties when the thermometer drops. In fact, there are times when the use of heated and insulated trailers is necessary. Oxidative and hydrolytic stability are also problems associated with biodiesel. The shelf life of biodiesel is limited due to the oxidative stability issue. Water also aggravates the oxidation issue plus adds other problems too. Biodiesel is a natural demulsifier. Water that accumulates at the bottom of a tank can lead to hum bug infestation and in cold weather can lead to icing. Either condition can stop dead a piece of equipment.

Diesel Algae

* “Humbugs” is short for Hydrocarbon Utilizing Microorganism.

* There are over 100 known varieties of Humbugs, including bacterium and fungi that eat diesel fuel (petro & bio), heating/fuel oil and even engine oil.

* Water is their oxygen source or air supply and they can be found at the water oil interface.

* Their by-products are additional water and corrosive organic acids.

* Damage from Humbugs can be significant, extensive and expensive.

* Contaminated fuel may have to be disposed of if left untreated.

* Frequent filter clogging can be an indicator of an active colony.

* The presence of black, brown or green slime is a good indicator of infection and is sometimes called “algae”, but is more commonly known as Humbugs.

* A “rotten eggs” smell is also a good indicator.

* Middle distillate fuel has low vapor pressure, making it vulnerable to condensation, making it a great habitat for humbugs.


A lot of talk these days concerns the use of ethanol in all grades of gasoline and the ever increasing push towards E85 fuel.

The negative talk is probably warranted. There are numerous drawbacks to an ethanol additized gas as well as ethanol based fuel such as E85 (85% ethanol, 15% gasoline).
Ethanol is a very effective “consumer” of water or moisture from condensation. It is so effective that when all available supplies of water in a tank has been consumed, ethanol will actually attract or draw additional water into its environment from the atmosphere. The actual term for this action is “Hygroscopic”.

Additional drawbacks to water and/or ethanol in fuel include but are not limited to the following:

Potential for “Phase Separation” –gas and ethanol separating; creating layers of different octane ratings and different levels of ethanol concentration.

Water allows for rust and scale.

Greater than 10% ethanol gasoline mix in a non flex-fuel vehicle can void warranty.

Increased vapor pressure; increased rate of evaporation.

Poor storage stability.

Highly reduced upper cylinder lubrication.

Increased stress on piston rings (compression ring specifically).

Ethanol is highly solvent- it can attack rubber fuel lines, fiberglass tanks, engine sensors and the resins/glues used in fuel pump assemblies.

Gross vs Net

Gross In The Fuel Industry Fuel volume can expand and contract depending on temperatures. This temperature-influenced expansion and contraction causes challenges for companies delivering gas. The amount delivered and the amount of fuel received can be different. This difference is referred to as net versus gross. With a formula that accounts for the expansion and contraction of the gross amount of fuel, we can determine the net gallons actually delivered. Wholesalers must also buy and sell fuel by net or gross gallons depending on the prevailing temperature in their region.

Challenges of delivering fuel

In the U.S., the volume of motor fuel is considered normal at 60 degrees F. As the temperature goes lower than 60, the volume contracts. As the temperature goes above 60, the volume expands. In the hot summer months, the temperature of the gas at the delivery truck can be higher than the insulated tanks below. When the warmed-up gas flows into the tank, it hits the cooler temperatures and begins to contract. That contraction means that a delivered load of 1000 gallons will actually end up less than 1000 gallons in the tanks. The net fuel is less than the gross delivered. In the cold winter months, the temperature of the gas at the delivery truck can be lower than in the insulated tanks below. When the cool fuel flows into the tank, it hits the warmer temperatures and begins to expand. That means the 1000 gallons delivered will end up being more than 1000 gallons in the tank. The net fuel is more than the gross delivered.

Accounting for the expansion and contraction of the gross amount of fuel and the net gallons actually delivered

The industry had to adjust how it measured gas to account for the fluctuations in volume. Using a thermodynamic formula, the industry calculates the size of the fuel’s expansion or contraction due to the difference in temperature. In simpler terms, the number of gallons coming out of the delivery truck (the gross amount delivered) is adjusted up or down. This adjustment of the gross amount makes up for the loss in volume during hot weather and the gain in volume during cooler weather. This temperature-corrected calculation determines the “net” gallons delivered.

Are wholesale fuel purchases by net or gross gallons?

To make the gas purchase simpler, wholesalers buy and sell fuel by “net” gallons in the warmer southern states. Conversely, they sell by “gross” gallons in the north, where a cooler climate prevails.


Diesel Fuel


E-10 Gasoline




Jet A


Aviation Gas



Remote Tank Monitoring

Fronk Oil offers the option to Monitor your Fuel Inventory for you. We can set up automated deliveries, unauthorized usage alerts, delivery alerts, and much more to assure your fuel is in the right place at the right time. Our monitors have proven to hold up in the most harsh conditions, providing long life and exceptional reliability.

Email Pricing

Tired of chasing down fuel prices daily? Sign up today for our daily price emails.


Tank Equipment

Need a stationary tank? Call us for all your needs.


Fuel Additives

In the harsh winter months, we always treat our diesel fuel with the best additives on the market today. Having trouble with Ethanol based fuel? Check out our friends at Primrose today.

We also Haul

Fuel for Hire.


Red River