Shell AeroShell
AeroShell Oil W100
SAE Grade: SAE 50
API: SAE J1899 (MIL-L-22851D)
AeroShell W100 Oils were the first non-ash dispersant oils to be used in aircraft piston engines. They combine non-metallic additives with selected high viscosity index base stocks to give exceptional stability, dispersancy and anti-foaming performance. These additives leave no metallic ash residues that can lead to deposit formation in combustion chambers and on spark plugs, which can cause pre-ignition and possible engine failure.
Detailed Product Description
AeroShell W100 Oils are available in four different viscosity grades:
- AeroShell Oil W 100 The suffix for each grade corresponds to the viscosity of the oil at 210F 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.
Specifications, Approvals & Recommendations
- The U.S. specification SAE J-1899 replaces MIL-L-22851D
- Although it was planned to replace the British Specification DERD 2450 with a DEF STAN specification this has now been put into abeyance and instead the SAE specification has been adopted.
- U.S. : Approved J-1899 SAE Grade 50
- British : Approved J-1899 SAE Grade 50
- French : AIR 3570 (Grade SAE 50)
- Russian : MS-20
- NATO Code : O-125 Obsolete
- Joint Service Designation : OMD-250
- Textron Lycoming : 301F
- Teledyne Continental : MHS 24B
- Pratt & Whitney : Service Bulletin 1183-S
- Curtiss Wright : Various Service Bulletins – refer to relevant Bulletin
- Franklin Engines : Various Service Bulletins – refer to relevant Bulletin
