The best premium diesel fuel on the market, plus lubricants, DEF and propane delivery.

Energy Options from Ag Partners

Energy is a big expense item on virtually every farm. Our team of experts at Ag Partners can help you lock in the best prices for the year ahead on premium diesel, gasoline and propane. As a Cenex distributor, Ag Partners proudly offers Ruby Fieldmaster, the industry standard for premium ag diesel fuel, as well as the full line of Cenex Premium Diesel Fuels and Gasolines, Ruby oil, and lubricant products.

Our field service and delivery teams are on call virtually around the clock during planting and harvest, and have been known to deliver propane on a long holiday weekend to a shivering homeowner. We know you have options for fuel service and delivery, but we’d like a chance to earn your business. If you’re a coop member, you’ll also be putting some of that money right back in your own pocket when patronage checks are mailed out.
Energy Propane

Propane Services

Take the hassle out of your life with a trusted and reliable company to meet your propane needs. We offer tank sales and leasing, contracting, and a variety of other options to keep your propane costs low.

Bulk Propane Delivery

Take the hassle out of your life with a trusted and reliable company to meet your propane needs. We offer tank sales and leasing, contracting, and a variety of other options to keep your propane costs low.

Our 11-man energy driving team has over 100 years of delivery experience and is dedicated to efficient energy delivery as well as keeping your house safe with our safety checks.

Ag Partners offers bulk propane delivery to homes, farms and shops out of our Seneca, Hiawatha and St. Marys locations.

For propane questions, please contact the location nearest you.

Delivery During Service Hours:
Seneca: 785.336.6153
Hiawatha: 785.742.2196
St. Marys:  785.437.2984 

After Hours Emergency Delivery (added fee):
Seneca: Will Engelken 785.294.2030 or
        Eric Osterhaus 785.294.2722
St Marys: Cody Randolph 623.640.6689 or
        Tim Woomer 785.871.0062
Hiawatha: Rusty Bannister 785.288.1442 or
           Eric Osterhaus 785.294.2722

Bottled Propane

We will refill bottled propane used for grills, RV's and trucks.

Refilling available at

  • Mr. Tire
  • St. Marys
  • Wamego
  • Hiawatha

Service Center Hours
8:00 - 5:00 Monday-Friday
8:00 - Noon Saturdays


  • We will set tanks and do minor tank repairs
  • Tank leasing and sales
  • Provide free leak checks for new customers, and then every five years to ensure safety
  • No fuel surcharge
  • No hazmat fee
  • Contracting options
  • Level-pay option: calculate what you’ll use for a year, then make monthly payments
  • Automated text alerts when propane is delivered
  • 24-hour emergency service (fee charged for after-hours calls)
  • Experienced drivers, timely delivery

Low Income Energy Assistance (LIEAP) Information >



Energy Fuels

Fuel Services

We offer Cenex Top Tier gasoline and Premium Diesel Fuels. Cenex Ruby Fieldmaster® premium diesel fuel provides optimal off-road performance for high-tech engines, including those that meet the Tier IV Final EPA emission standards. Its industry leading, multifunctional additive package contains a unique combination of seven additives that prevents injector fouling and filter plugging to minimize costly downtime.


Bulk Fuel Delivery

  • 87 E-10
  • 87 Unleaded
Road Diesel:
  • Roadmaster XL Premium Highway Diesel Fuel
  • #1 Clear Diesel
  • #2 Clear Diesel (available in transport loads)
Off-Road Diesel:
  • Ruby Fieldmaster Premium Diesel
  • #1 Red Diesel

Self-Service Fuels

  • Gas-91 Premium Unlead (Seneca Pumps)
  • 87 E-10 (All Fuel Pumps)
Road Diesel:
  • Roadmaster XL Premium Highway Diesel Fuel (All Fuel Pumps)
Off-Road Diesel:
  • Ruby Fieldmaster Premium Diesel (Axtell & Seneca Pumps)


Fuel Pump Services

We have 24-hour access cardtrol fuel pumps in Seneca, Bern, Corning, Vliets, Axtell, Powhattan, Willis, Denton, and Robinson. They all accept customer fuel cards that are linked to your Ag Partners Coop account so you can receive one total bill each month. All pump locations, with the exception of Vliets, also accept major credit cards.

Delivery Services
  • Fuel tank leasing and sales
  • No fuel surcharge
  • No hazmat fee
  • Contracting options
  • Level-pay option: calculate what you’ll use for a year, then make monthly payments
  • Experienced drivers, timely delivery

Energy Lubricants

Grease & Lubricants

As a farmer, you face a multitude of hard-to-control challenges. One thing you can control is what you put in your equipment. Cenex lubricants stand the test of time with more than 75 years of proven off-road performance. They keep your engines and hydraulics running smoothly and provide superior protection for overworked load-bearing equipment.


We offer:

  • Cenex Blue Gard 500+
  • Cenex Molyplex 500+
  • Red Protect XT

More about Cenex products >


We offer bulk delivery of:

  • 55-gallon drums
  • 275-gallon totes
  • 330-gallon totes

DEF is also available at the pump at our Seneca cardtrol location.



We offer:

  • SAE
  • Superlube 518
  • Superlube TMS
  • Qwiklift HTB
  • Auto Gold
  • Indol ISO VG
  • Maxtron DEO
  • Power Trans
  • Auto Gold SAE
  • Maxtron Full Synthetic
  • Maxtron MT SAE
  • TMS 15W40
  • TMS 10W30

More about Cenex Agriculture Lubricants >

More about Cenex Car and Light Truck Lubricants >


Oil Totes
Ag Partners Coop sells, leases, and refills oil totes in 60, 80, 120, 180, and 240-gallon sizes. Bulk oil delivery is also available in bulk cubetainer systems (pictured below).

Oil Totes

Cenex Premium Diesel Fuels Features & Benefits

Injection Stabilizer
What It Does
Address fuel oxidation problems in new engine technology fuel injectors and prevents internal diesel injector deposits (IDID) from forming deep inside high-precision injectors.
How You Benefit:
-Less filter and injector replacements in new engine technologies
-Less downtime and maintenance costs

What It Does
Aggressive detergent components keep fuel systems clean and performing at their optimum level.

How You Benefit:
-improved fuel efficiency (up to 5% better in comparison to a typical #2 diesel fuel)
-4.5% improved power
-Cleans injectors and prevents deposit buildup
-Maintains ideal injector spray pattern

Cetane Improver
What It Does
Cetane is a measure of diesel engine startability. The higher the cetane number, the quicker the fuel will ignite. Cenex Premium Diesel Fuel has a typical cetane number of 47-49.
How You Benefit:
-Reduced strain on engines and electrical systems
-Less downtime and maintenance cost
-Quicker, more fuel-efficient starts
-Smoother running engines
-Better cold weather starts

Lubricity Improver
What It Does
Friction-reducing agents provide 10-15% better protection against friction and wear on the fuel pump than typical #2 diesel fuel.

How You Benefit:
-Protects injectors and injector pumps against wear
-Meets OEM fuel lubricity recommendations

What It Does
Demulsifiers force water to the bottom of the tank, allowing for easy drainage and removal. This prevents unwanted moisture from being carried through the fuel system and reduces the volume of water entering the combustion chamber.
How You Benefit:
-Easier removal of water from storage tank
-Less wear on injectors
-Fewer filter replacements
-Prevents algae formation in storage tanks

Corrosion Inhibitors
What It Does
Provides superior corrosion protection, preventing the formation of rust on metal parts.

How You Benefit:
-Reduces downtime and repair costs
-Slows the natural degradation of diesel fuel caused by exposure to oxygen
-Prevents corrosion-caused leaks, blockages and breaks in metal parts

Storage Stabilizers
What It Does
Reduces gum and varnish buildup and contains components to extend the storage life of diesel fuel.

How You Benefit:
-Extends storage life of diesel fuel by 3-6 months
-Tolerates temperature extremes
-Increases injector life and optimizes combustibility


Cenex Total Protection Plan

You’ve made a huge investment in your equipment and we understand that keeping your equipment running at peak performance is critical to your business. That is why we offer the Cenex Total Protection Plan® Warranty. A comprehensive risk management tool for your operation that keeps you in the field and provides you peace of mind.                                                      

For more information, contact one of our Certified Energy Specialists                                                                   

Travis Schulte: 785-741-5252                                                                                
Wade Smith: 785-294-2091
Weston Smith: 417-850-9976                
Brian Wheeler: 816-804-1392                        

Fuel Your Community

Since 2021, a portion of sales from every gallon sold at our fuel pump locations has been donated back to organizations in the surrounding communities. Recipients change annually, alternating between school and community organizations.

2023 Recipients:

Axtell FFA

Centralia FFA

Doniphan West FFA

Hiawatha FFA

Nemaha Central FFA

Bern School Activities Complex

Energy Team