Phillips 66 X/C 25W-60
X/C 25W-60 is the first and only multiviscosity aviation oil designed and approved for radial engines originally designed to run on 120 grade. Pilots and mechanics will notice immediate benefits with X/C 25W-60 over single grade oils. Benefits such as improved oil flow at startup, quicker warm-up time, cooler operating temperatures and a cleaner operating engine. X/C 25W-60 also has proven corrosion protection in extreme conditions. X/C 25W-60 can be used year-round, during break-in and on to TBO.
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.
My aircraft is powered by a Lycoming 0-540 1900 hours and this oil works very well. It produces consistently lower temps in climb, better fuel economy in cruise, (better by an average of 1 gph), and less oil use. My cylinder leakage is the high 70s over 80. In my opinion this is the best oil for piston engines.
What a savings! 4 gallons of oil for $88, compared to 12 qt case (3 gallons) for $96. I should have switched years ago since my plane holds 4 gallon of oil.
The GL represents gallon. It is noting that part # 08-00886 is a case of 4 gallons.
Per Vendor: 25W60 is usually recommended for radial piston engines. For horizontally opposed piston engines we would recommend either straight 50 or 20W-50 depending on the Lycoming engine model number.