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Phillips 66 X/C Aviation Oil is an ashless dispersant, multigrade 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 (nondispersant) mineral oils.

X/C Aviation Oil was the first FAA-approved mineral oil-based, ashless dispersant, multiviscosity 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.


  • 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


  • Avco Lycoming Material Specification No. 301G
  • Pratt & Whitney 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 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 with no sacrifice in performance.
  • Recommended for use during break-in and then as the operational oil until TBO. X/C
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Shipping was on time and the product we have used for years. (We have had no problems with this product)

Donald F
October 26, 2020

Excellent oil, Excellent service by Aircraft Spruce!!!

October 6, 2020

Arrived in two days - great service

Sarah N
October 5, 2020

Just the oil needed for frigid northern winters. Been using for 30 years. Engines consistently go beyond TBO.

Walter A
September 22, 2020

The oil arrived quickly and at a great price since I purchased in bulk and got free shipping. However, one of the gallon jugs did leak out into the box but when I called the company they were more than happy to replace it.

Sarah T
September 17, 2020

good product

Jeffrey M
September 8, 2020

It’s Oil! Fast shipping. Thanks

September 3, 2020

Phillips X/C 20w50 is a great all-around oil for nearly any aircraft, any season. Aircraft Spruce always has a competitive price, and usually with the shipping is a better deal than others. Their service has always been fast - usually I get any item within 2 days with no extra shipping charge. Great company, great oil - cant go wrong.

Stephen M
August 12, 2020

I settled in this oil after some issues with other brands. It seems to do a great job of suspending the lead sludge we all get from 100LL.

August 7, 2020

I like the gallon bottles for oil change time. You get a 4 for 1 in uncapping. Its not really cheaper per ounce, but its convenient.

Erich S
August 5, 2020


Q: What is the difference between the XC and XTC?

Per the supplier: We have not heard of XTC. Phillips oil does not have an XTC version, only X/C.

Q: Can I get the case price for the Phillips 66 X/C aviation oil 20W50?

You can select a case in the ordering drop down on this page. Once you make the selection, the part # and price for a case of 12 quarts will be displayed. It is also available in single quarts, a 55 gallon drum, or a case of 4 gallons.

Q: How can one read the date of manufacture from the bottle of Phillips 66 XC oil 20W50? And what is the shelf life?

For example, the code on the bottle will be formatted like this LL41A24017. To read the manufacture date, the first 5 characters are irrelevant. So, in this case, the date comes from 24017. To read it, it is the 240th day of the year 2017. If the code was LL41A00118, that would be manufactured January 1st, 2018. According to Phillips tech support, there is set shelf life for this oil as long as it is stored properly. After 5 years, they recommend the oil be retested prior to use.

Q: Does Philips 66 cross country X/C 20/50 contain cam guard?

It does not but it can be added to it.

Q: Does the Phillips 66 20w50 12-case come with that handy blue oil spout?

Yes, each 12 quart case comes with a free pour spout.

Q: Is type m 20w50 compatabile with xc 20w50?

Type m is mineral oil for engine break in. You would not want to use it on an engine that is already broken in.

Q: What is the weight per case of the 12 x 1 liter of the Phillips 66XC oil?

1 case of 12 quarts weighs approximately 26 lbs.

Q: What is the difference between the XC and victory oil?

The Victory oils have the LW-16702 additive blended in.