Spring into Action with W&H Diesel: Ruby Fieldmaster & Roadmaster XL
Learn the difference between Ruby Fieldmaster and Roadmaster XL diesel fuels from W&H Cooperative. Get premium diesel delivery in Iowa for both off-road and on-road needs.

Whether you’re working the fields or fueling your fleet, W&H Cooperative has the premium diesel products to keep you running strong. Read more to learn the difference.
Ruby Fieldmaster: Red-Dyed Diesel Built for the Field
Use Cases: Tractors, combines, generators, construction equipment, and other non-road vehicles
Color: Dyed red (no road tax)
Ruby Fieldmaster is a dyed diesel designed for off-road agricultural and commercial use. It contains the same high-performance additives as its taxed counterpart but is dyed red to signify that it is exempt from road taxes. Using Ruby Fieldmaster on public roads is illegal—but for everything from planting and harvesting to grain drying and irrigation pumps, it’s your fuel of choice.
Ruby Fieldmaster includes:
- Premium detergents to clean fuel injectors
- Lubricity agents to protect fuel system components
- Demulsifiers for water separation
- Corrosion inhibitors to extend equipment life
This is fuel you can trust with your toughest jobs, all while keeping your operation efficient and compliant.
Roadmaster XL: Premium Diesel for On-Road Performance
Use Cases: Farm delivery trucks, semis, personal diesel pickups, and commercial fleets
Color: Clear (taxed fuel)
Roadmaster XL is the clear diesel version of Fieldmaster—taxed for road use, but offering the same additive-rich formula for maximum power and engine protection. Whether you’re making deliveries across county lines or hauling heavy loads through town, Roadmaster XL helps your diesel engines run smoother and last longer.
Roadmaster XL provides:
- Improved combustion and reduced emissions
- Better fuel economy thanks to cleaner injectors
- Superior cold weather performance for year-round use
- Reliable support from the W&H energy delivery team
Plus, with bulk delivery options, on-site tanks, and flexible fueling programs, we make sure your operation never skips a beat.
Get the Diesel You Need—When You Need It
At W&H Cooperative, we deliver both Ruby Fieldmaster and Roadmaster XL across our Iowa service area with prompt, reliable delivery and local support you can count on. Whether you’re planning for seasonal diesel contracting or topping off your tank before the next job, our team is here to help.
And remember—May marks the start of our propane summer fill and contract season, so it’s the perfect time to check all your energy needs.
Let’s keep your season running strong.
Spring into Action with W&H Diesel: Ruby Fieldmaster & Roadmaster XL
Learn the difference between Ruby Fieldmaster and Roadmaster XL diesel fuels from W&H Cooperative. Get premium diesel delivery in Iowa for both off-road and on-road needs.
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