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Phillips 66 Diesel Lube SAE Grade 40 Oil R-25  (discontinued **)
Categories: Fluid; Lubricant

Material Notes: Conoco® Diesel Lube Oil R-25 is a high-quality, zinc-free, heavy-duty diesel engine oil designed for use in all 2-stroke cycle and 4-stroke cycle railroad locomotive diesel engines. It also is recommended for use in railroad-type diesel engines used in marine service or in stationary service for power generation. It is formulated with a new technology, reduced ash (9 TBN) additive package that is particularly recommended for use in modern EMD and GE power units running on low or ultra-low sulfur diesel fuel. Diesel Lube Oil R-25 is formulated with an advanced additive technology that provides improved oxidative stability, soot dispersancy and wear protection for use in the newer, low exhaust emissions, low oil consumption railroad diesel engines. It has excellent oxidation resistance, high dispersancy and improved TBN retention to protect against deposit formation and help maintain engine cleanliness, even in extended drain or severe service intervals. It provides excellent wear protection and is non-corrosive to yellow metals. The additive package is zinc-free to protect silver bearings and bushings found in older EMD diesel engines, and is non-chlorinated to permit easier recycling or disposal of used oil. Diesel Lube Oil R-25 meets or exceeds the performance requirements of the LMOA Generation 5 and GE Generation 4 Long Life railroad diesel engine oil standards. The low-SAPS formulation is designed for use in diesel engines operating on low or ultra-low sulfur diesel fuel, and also is compatible with the future exhaust after treatment technologies under development for use in these engines.


  • All 2-stroke cycle and 4-stroke cycle railroad locomotive diesel engines, including newer, low exhaust emissions power units
  • Railroad-type diesel engines used in marine service
  • Railroad-type diesel engines used in stationary service for power generation or offshore drilling equipment
Diesel Lube Oil R-25 is recommended for use in locomotive diesel engines manufactured by ALCO, Baldwin-Lima-Hamiltion, Caterpillar, Cleveland, Electro-Motive Diesel, Fairbanks Morse and General Electric.Features/Benefits:
  • New technology, reduced ash (9 TBN) additive package for modern railroad locomotive diesel engines
  • High dispersancy-detergency to protect against sludge and varnish formation
  • Improved TBN retention for extra protection in longer or more severe service intervals
  • Helps keep engines clean and extend oil filter life
  • Minimizes port blocking in 2-stroke cycle engines
  • Protects against rust and corrosion
  • Non-corrosive to silver engine components in older EMD engines
  • Non-chlorinated additive system for easier recycling or disposal of used oil
  • Low-SAPS formulation for compatibility with future exhaust after treatment technologies

Information provided by Phillips 66 Lubricants. Phillips 66 Lubricants was spun-off from ConocoPhillips in 2012, and branding was further reorganized in 2016. The Conoco® trade name is no longer in use but products may be available under different names.

Available Properties
  • Specific Gravity
  • Density
  • Viscosity Measurement, Index
  • Kinematic Viscosity at 40°C (104°F)
  • Kinematic Viscosity at 100°C (212°F)
  • Ash, ASTM D874, Sulfated
  • ASTM Color, ASTM D1500
  • Pour Point
  • Flash Point, COC
  • Zinc, Zn
Property Data

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