Performs best between 16°C and 32°C (60.8°F to 89.6°F ambient air temperature).
Utilizes ashless dispersant additive technology to prevent deposit build-up, for cleaner and more efficient engine performance.
| Country | Specification |
|---|---|
|
SAE |
J1899 Grade 50
|
|
Joint Service Designation |
OMD-250
|
|
Lycoming Engines |
Service Instruction No. 1014 N
|
|
Continental Aerospace Technologies |
MHS-24
|
|
Pratt & Whitney |
Service Bulletin 1183
|
|
Curtiss Wright |
Various Service Bulletins – refer to relevant Bulletin
|
|
Franklin Engines |
Various Service Bulletins – refer to relevant Bulletin
|
AeroShell W Oils are available in three different viscosity grades: AeroShell Oil W80 – AeroShell Oil W100 – AeroShell Oil W120.The suffix for each grade corresponds to the viscosity of the oil at 210°F in Saybolt Universal Seconds.
AeroShell W Oils are intended for use in four-stroke (four-cycle) certified reciprocating piston engines, including fuel-injected and turbocharged engines. AeroShell W Oils are not recommended for use in automotive engines. For automotive engines converted for use in aircraft, the specific engine manufacturer or the conversion agency should be consulted for proper oil recommendation.
Most radial engine operators use AeroShell Oil W120 in warm weather operations with AeroShell Oil W100 or AeroShell Oil W 15W-50 being used in cooler ambient temperatures.
AeroShell Oil W100 or AeroShell Oil W 15W-50 are the common choices for most operators of Lycoming and Continental flat engines but, during colder parts of the year, use of AeroShell Oil W80 in place of AeroShell Oil W100 would be an excellent choice.
Although some aircraft engine manufacturers and rebuilders/overhaul agencies suggest in their service bulletins the use of a straight mineral oil in new or newly overhauled engines, other rebuilders or manufacturers, especially for engines such as the Lycoming O-320H and O/LO360E, allow either ashless dispersant or straight mineral oil for break-in, whereas ashless dispersant oils are mandated for break-in for all turbocharged Lycoming engines. Operators should check with engine manufacturers or rebuilders for the correct recommendation for the specific engine and application.
Too See AeroShell Oil W100 technical data sheet (TDS) and the AeroShell Oil W100 safety data sheet (SDS). Visit here
AeroShell Oil W100 is a premium ashless dispersant (AD) monograde oil specifically designed for four-stroke aviation piston engines. It is widely used in Lycoming and Continental engines that have completed their break-in period and require a high-quality mineral oil that prevents the buildup of engine deposits.
The "Ashless Dispersant" formulation means the oil contains non-metallic additives that hold combustion by-products (like soot and lead) in suspension. This prevents them from forming hard ash or sludge deposits on engine surfaces, spark plugs, and oil galleries, ensuring a cleaner engine and longer TBO (Time Between Overhaul).
AeroShell Oil W100 is an SAE 50 grade oil intended for use in warm to hot ambient temperatures, typically ranging from 15°C to 32°C (60°F to 90°F). For colder environments, a lighter grade like W80 or a multi-grade like 15W-50 is recommended to ensure proper flow during startup.
No, it is generally recommended to use a straight mineral oil (like AeroShell Oil 100, without the "W") for the initial 25–50 hours of a new or overhauled engine's life. This allows the piston rings to seat properly against the cylinder walls. Once the break-in is complete, you should switch to W100 for ongoing protection.
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