AeroShell W oils were the first ashless dispersant oils to be used in aircraft piston engines. They are a blend of non-metallic additives and a high viscosity index base oil, to deliver exceptional stability and dispersant and anti-foam performance. These additives leave no metallic ash residues, which can lead to deposit formation in combustion chambers and on spark plugs, which in turn can cause pre-ignition and possible engine failure.
Applications
AeroShell W oils are available in four different viscosity grades:
AeroShell Oil W65 - AeroShell Oil W80 - AeroShell Oil W100 - AeroShell Oil W120. The suffix for each grade corresponds to the oil's viscosity at 210 0 F in Saybolt Universal Seconds (SSU).
AeroShell W oils are intended for use in engines certified for four-stroke (four-cycle) piston applications, including fuel-injected and turbocharged engines. AeroShell W oils are not recommended for use in automotive engines. For automotive engines converted for aircraft use, you should consult the engine manufacturer or the conversion agency for the appropriate oil recommendations.
Most radial engine operators use AeroShell Oil W120 in hot-weather operations, and AeroShell Oil W100 or AeroShell Oil W 15W-50 for use at lower ambient temperatures.
AeroShell Oil W100 or AeroShell Oil W 15W-50 are common choices for most operators of Lycoming and Continental flat engines, but in the colder periods of the year, the use of AeroShell Oil W80 instead of AeroShell Oil W100 would be a choice
Although some aircraft engine manufacturers and builders/overhaul agencies suggest in their service bulletins the use of a straight mineral oil in new or recently overhauled engines, other builders or manufacturers — particularly for engines such as the Lycoming O-320H and O/LO360E — permit either ashless dispersant or mineral oil for break-in, while ashless dispersant oils are mandated for break-in on all turbocharged Lycoming engines. Operators should check with the engine manufacturers or builders for the correct recommendations for particular engine types and applications.
The suffix for each grade corresponds to the oil's viscosity at 210 0 F in Saybolt Universal Seconds (SSU)
Performance & benefits
Promotes engine cleanliness
Helps keep engines clean and free of sludge
Helps engines reach TBO (time between overhauls)
Protects heavily stressed engine parts against scuffing and wear
Helps reduce oil consumption
Although it was planned to replace the British DERD 2450 specification with the DEF STAN specification, this was put on hold and the SAE specification was adopted instead
Standards & approvals
Pratt & Whitney : Service Bulletin 1183-S
Pratt & Whitney Service Bulletin 1183-S
The Pratt & Whitney service bulletin listing the oils approved for its own gas turbines.
Also listed
U.S. : Aprobat J-1899 SAE Grad 50
British : Aprobat J-1899 SAE Grad 50
French : AIR 3570 (Grad SAE 50)
Russian : MS-20
NATO Code : O-125 obsolete
Joint Service Designation : OMD-250
Textron Lycoming : 301F
Teledyne Continental : MHS 24B
Curtiss Wright : Various Service Bulletins
Franklin Engines : Various Service Bulletins
Specificatia U.S. SAE J-1899 inlocuieste MIL-L-22851D
Approved for
Pratt & Whitney
Lycoming
Continental
Textron
Teledyne
Typical characteristics
Property
Typical value
Method
SAE viscosity grade
50
Colour
4.0
Astm D1500
Density @15°Ckg/l
0.884
Astm D1298
Kinematic viscosity @40°Cmm2/s
200
Astm D445
Kinematic viscosity @100°Cmm2/s
20.2
Astm D445
Viscosity index
118
Astm D2270
Pour point°C
< -18
Astm D97
Flash point (COC)°C
> 260
Astm D92
TANmgKOH/g
<0.01
Astm D664
Sulphur% m
0.38
Astm D129
Copper corrosion @100°C
1
Astm D130
Ash content% m
0.006
Astm D482
Complete documentation
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