Mulgrew Oil & Propane Co. is a tri-state market leader in wholesale distribution of branded diesel fuels from our producers: BP, ConocoPhillips, Sinclair, Valero, and our own custom-blended soy Biodiesel fuel.

You have specific needs for wholesale diesel fuel, such as truck and bus fleet transportation, agricultural, off-road and construction equipment, heavy machinery, and generators. Mulgrew Oil Co. energy specialists are trained to find solutions to your specific need for diesel #1 & #2, premium grades, and biodiesel blends.

Since 1893, Mulgrew Oil Co. has been serving the area industry energy needs. Mulgrew now offers high-quality wholesale diesel fuels, biodiesel, and diesel-related products, such as DEF, throughout the tri-state area. Our reputation in the communities we serve has been built over the years on solid, long-term, customer relationships. Attention to customer support with delivery schedules tailored to your requirements makes it easy for you to receive quantities large and small.

You want reliability in your diesel-powered operations. Mulgrew Oil Co. is a proud wholesaler of BP Diesel®, a workhorse fuel that helps your diesel engine unleash its potential by enabling both its power and performance, helping it to deliver the fuel efficiency you expect over a gasoline engine. Plus, BP Diesel® contains diesel fuel additives to improve lubricity, helping to protect your diesel engine investment for years to come.

Timely, personalized tank wagon deliveries have been the hallmark of Mulgrew Oil & Propane Co. for decades. A family-owned business since 1893, we deliver competitively priced diesel and gasoline fuels to our valued clients in the tri-state area.

Mulgrew Oil & Propane Co. recognizes your need for prompt bulk delivery of quality diesel fuel, whether on-road or on-site at the time you need it. Our tank wagon drivers have built consistent, reliable relationships with clients along our routes in the tri-state area. They understand your specific delivery requirements, in tandem with our energy specialists to make sure your operation runs smoothly with delivery you can trust at competitive prices.

Convenient, tank wagon service is available from the following bulk distribution plants in Iowa: Olewein, Monona, Waukon, Lansing, Strawberry Point, Dubuque, Cascade, DeWitt, Clinton, and Scales Mound in Illinois — serving northeast Iowa, southwest Wisconsin, and northwest Illinois.


Mulgrew Oil & Propane Co. is a tri-state market leader in wholesale distribution of branded diesel fuels from our producers: BP, Sinclair, and our own custom-blended soy Biodiesel fuel.


Gasoline products have standardized over the years, following both modern automobile engine requirements or user preferences. Unleaded means it contains no ethanol (a corn-based ethyl alcohol) and is 100% pure gasoline produced without tetraethyllead — which is now phased out in the U.S.

Pure gasoline is also blended with ethanol with percentages ranging from E10 (10% ethanol) to E85 (85% ethanol) produced for flex-fuel cars. The primary purpose of ethanol is to oxygenate the fuel at the pump to reduce fuel emissions.

Octane ratings or octane numbers are a standard measure of the engine’s performance. Fuels with higher octane ratings are generally used by engines requiring higher compression ratios. Most modern engines will operate normally on “regular” grades with 10% ethanol.

Octane ratings are not indicators of energy content in the fuel. They measure only the fuel’s tendency to burn in a controlled manner. Racing fuels, for instance, may have a variety blends which can produce an octane rating of 110 or much higher

Mulgrew Oil & Propane Co. delivers the following gasoline products:

  • Unleaded
  • Premium
  • E85
  • Ethanol Blends
  • Racing Fuel


The diesel engine has proven to be extremely energy efficient and cost effective. Even though diesel fuel may priced a bit higher than gasoline, it delivers more energy than gasoline in the same volume comparison. The tough, durable diesel engine provides much higher mileage, making it the obvious choice for automobiles, heavy transport vehicles and off-road equipment.

Diesel Advantages

Modern diesel engines are quieter and maintenance costs have been reduced.
There is no sparking upon ignition. Without spark plugs and wires, maintenance costs are lowered.
Engines are rugged and made to last.
A water-cooled diesel unit can operate for 12,000 to 30,000 hours before major maintenance is needed.
Fuel costs figured in kilowatt units produced can be 30-50% less than gas engines.
Diesel engines have a wide variety of uses, such as power generators, mechanical drives, locomotives, construction equipment and countless industrial applications.

Mulgrew Oil & Propane Co. delivers the following Diesel products:

  • On-Road #1 and #2
  • Off-Road #1 and #2
  • Premium
  • Biodiesel Blends
  • Kerosene
  • Home Heating


Biodiesel is a renewable, clean-burning diesel replacement that’s helping to improve the environment. Biodiesel operates in conventional combustion engines and requires no special storage. Mulgrew Oil Co. will custom blend soy biodiesel to your specific requirements with a range of B1 to B100

Biodiesel benefits: An alternative fuel that extends the value of petroleum and the cleanliness and life of diesel engines. A fuel mixture containing 1% biodiesel can increase the lubricity of your fuel by as much as 65%. It’s non-toxic… research has shown it to be 10 times less toxic than table salt.

Biodiesel is the only biofuel to successfully complete emissions testing in accordance with the Clean Air Act. It contains no hazardous emissions, it’s biodegradable, renewable and locally produced, making us less dependent on foreign oil.


Selective Catalytic Reduction (SCR) is an exhaust after-treatment system that injects a small amount of Diesel Exhaust Fluid (DEF) into the exhaust. Mulgrew Oil Co. DEF meets the stringent Clean Air Act standards for SCR technology that diesel engine service warranties specify. Available sizes: 330 gal. totes; 55 gal. drums; 2.5 gal. jugs and bulk delivery.

Two of the great benefits that SCR technology has provided is a 3-5% savings on fuel and a reduction of nitrogen oxide (NOx) emissions. Diesel Exhaust Fluid is an important part of SCR technology, so what is it? DEF is a clear fluid mixture of pure automotive-grade urea (32.5%) and deionized water (67.5%). It’s nonflammable, nontoxic, non-explosive and nonhazardous. Caution should be taken in exposing DEF to metals. Stainless steel and HDPE (high density polyethylene) are the approved substances to come into contact with DEF.

Storage for Mulgrew Oil Co. DEF is recommended in temperatures between 40 and 80 degrees for a shelf life up to one year. The most important quality of DEF is its purity. Keep unused DEF free from any contamination. Vehicle manufacturers place either a dashboard gauge or warning light to avoid running out of DEF. In certain vehicles, the engine may stop or speed will be slowed if your DEF tank runs dry.