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Cenex® Ruby Fieldmaster®

Fueled by Innovation. Powered to Perform.®

Precisely formulated premium off-road diesel with a terminally injected additive package for optimal power, performance and protection.

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The next generation of premium diesel fuels

Cenex® Ruby Fieldmaster® premium diesel fuel is precisely formulated to deliver superior engine performance and fuel efficiency while preventing costly equipment downtime, even in the harshest field environments.

An industry-leading premium diesel additive package enhanced with:

  • Advanced, aggressive detergency that effectively removes engine deposits and keeps injectors clean, extending engine lifespan
  • A state-of-the-art two-phase total water management system that optimizes combustion and boosts engine function
  • Exceptional filterability that protects equipment from harmful contaminants, minimizing equipment damage and operational disruptions
  • A complete fuel burn that minimizes waste and improves overall fuel efficiency, delivering more hours per gallon

Grower spraying a field in a tractor

Better than any off-road premium diesel formula that has come before

Power through tight deadlines and rugged work conditions with high-quality, dependable Cenex Ruby Fieldmaster.
  • Aggressive detergency package

    Keep engines running cleaner, longer with an aggressive detergency package that gives you optimal engine performance and efficient combustion—better than any formula that’s come before. 
  • Total water management system

    The two-phase system efficiently separates free water from fuel, allowing it to settle quickly at the bottom of fuel storage tanks for easy drainage and removal. Any remaining negligible water is encapsulated for safe passage through the combustion chamber, ensuring your fuel system runs smoothly and efficiently. 
  • A more complete fuel burn1

    With lower temperature fluctuations, more complete combustion is managed evenly across the entire engine. That’s because ultra-clean injectors share the work. As a result of this improved efficiency, less soot is produced and fewer regenerations occur—and that means less wear and tear on the exhaust system.
  • Exceptional filterability

    Keep equipment running smoother, longer with exceptional filterability that protects the engine and exhaust aftertreatment systems.  

1. In comparison to the previous generation of Cenex® premium diesel fuel

Superior chemistry. Superior performance.

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Injection and combustion optimization

Addresses fuel oxidation problems in new engine technology 

  • Prevents diesel fuel from coking 
  • Reduces critical component and injector repairs and replacements 
  • Prevents internal diesel injector deposits from forming deep inside high-precision injectors 
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Storage stability

Extends storage life months longer than typical #2 diesel 

  • Tolerates temperature extremes
  • Reduces gum and varnish buildup
  • Increases injector life and optimizes combustibility
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Corrosion protection

Protects fuel lines from rust and corrosion

  • Prevents rust and corrosion from forming on metal parts
  • Protects fuel systems from rust and pitting
  • Prevents corrosion-caused leaks, blocking and breaks
  • Slows natural diesel fuel degradation caused by exposure to oxygen 
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Improved lubricity

Protects moving parts from excessive wear and failure 

  • Provides 10% to 15% more lubricity2 
  • Protects engine components, injector and fuel pumps against wear 
  • Meets OEM fuel lubricity recommendations 

2. In comparison to typical #2 diesel

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High cetane number

Enhances ignition quality for quicker, smoother starts

  • Generates fewer emissions for longer-lasting diesel particulate filters
  • Fewer regenerations
  • Reduces wear and tear on vehicle starter and battery
  • Improves cold weather starts 

Unmatched industry expertise

High-quality Cenex premium diesel and lubricants products are engineered to enhance equipment performance, extend engine life and power daily operations in the field, on the job site and over the road. 
  • Agriculture Industry Hero Image
    Our Industries
    Agriculture
    Fuel operations and protect farm equipment in every season.
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  • Construction Industry Hero Image
    Our industries
    Construction
    Safeguard equipment from onsite debris and heavy loads.
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  • Mining Industry Hero Image
    Our industries
    Mining
    Stand up to extreme working conditions.
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