Phillips 66 X/C Aviation Oil 20W-50

Phillips 66 X/C 20W-50 is a proven, ashless dispersant, multi-grade aviation engine oil designed for year-round use in aircraft piston engines.

As the first FAA-approved mineral-based multi-viscosity ashless dispersant oil, X/C has over 30 years of proven performance across a wide range of aviation applications including flight schools, charter operations, aerobatic aircraft, and general aviation fleets.

Its multi-grade formulation ensures easier cold starts, faster oil circulation, reduced warm-up time, and lower oil consumption compared to single-grade oils. At the same time, it maintains excellent film strength under high loads and temperatures, protecting against wear and piston scuffing.

The ashless dispersant additive system helps keep engines clean by minimizing sludge, varnish, and combustion deposits, contributing to longer engine life and reliability.

Phillips 66 X/C 20W-50 can be used during engine break-in and continued through normal operation up to TBO, making it a versatile choice for aircraft operators.

Key Features

• Multi-grade SAE 20W-50 aviation engine oil
• Ashless dispersant formulation for cleaner engines
• Excellent cold-start performance and reduced warm-up time
• High film strength for wear protection under load
• Suitable for break-in and continued operation
• Reduces oil consumption and engine deposits
• Proven performance over 30+ years in aviation use

Compatibility & Approvals

• Lycoming Specification 301G
• Teledyne Continental MHS-24B
• SAE J1899
• MIL-L-22851D (obsolete spec)

Typical Applications

• Lycoming and Continental piston engines
• Replacement for SAE 65, 80, and 100 single-grade oils
• Flight training and frequently operated aircraft
• Aircraft requiring year-round multi-grade oil