Phillips - X/C 20W50 Multi Grade Piston Aircraft Aviation Oil

Phillips 66 Company


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Phillips - X/C 20W50 Multi-Grade Piston Aircraft Aviation Oil


  • Ashless dispersant helps minimize engine sludge and varnish deposits for a cleaner engine.
  • Easier starting and faster oil circulation at low temperatures compared with single-grade oils.
  • Reduced warm-up time and cooler operating temperatures compared with single-grade oils.
  • High film strength for protection against wear and piston scuffing, even under high-load conditions, such as takeoff, and at elevated operating temperatures
  • Provides cleaner and quicker break-in than traditional all-mineral, non-additized, single-grade oils
  • Protects against rust and corrosion.
  • Reduces oil consumption in most engines.
  • Suitable for year-round use.

Phillips 66® X/C Aviation Oil is an ashless dispersant, multi-grade engine oil specially formulated for year-round use in aircraft piston engines. It provides distinct performance benefits compared with single-grade engine oils, including easier starting and faster oil circulation at low temperatures, reduced warm-up time, and reduced oil consumption in most engines. It maintains its film strength under high loads and at high temperatures to protect against wear and piston scuffing. The ashless dispersant formulation helps minimize the formation of engine sludge,  varnish, piston deposits, and combustion chamber deposits, resulting in a much cleaner engine compared with the use of straight (non-dispersant) mineral oils.

X/C Aviation Oil was the first FAA-approved mineral oil-based, ashless dispersant, multi-viscosity aviation engine oil. It has more than 30 years of outstanding, proven performance in a wide variety of aviation uses, including flight schools, charter and cargo airlines, acrobatic aircraft, spray planes, race planes, and virtually any other general aviation application. It is available throughout the United States and is exported to other countries around the world.


  • X/C 20W-50 Aviation Oil is recommended for use in opposed-piston engines. It can replace Commercial Grade 65, 80, or 100 single-grade engine oils within sacrifice in performance.

X/C Aviation Oil meets the requirements of:

  • Avco Lycoming Material Specification No. 301G
  • Pratt & Whitney Service Bulletin No. 1183 Rev. U
  • SAE Standard J1899
  • Teledyne Continental Material Specification MHS-24B
  • U.S. Military Specification MIL-L-22851D (obsolete) for additive treatment
  • QPL Approval Numbers: D07L1-20W-50 (X/C 20W-50), D07L1-25W-60 (X/C 25W-60) X/C® Aviation Oil

Search Terms: 48250 , 1045446, 1045441, 1045457 

Customer Reviews

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Customer Reviews

Based on 1 review
Excellent all around oil for my continental IO550

X/C 20W-50 Aviation Oil Is an Excellent mineral based oil . It’s the only one I use in my cirrus sr22 from the time the engine was new until now. 5 years and closed to 800 hrs ,no issues at all