AeroShell Oil W100
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AeroShell W 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.
APPLICATIONS
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 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 engine manufacturers and overhaulers suggest in their service bulletins
the use of a straight mineral oil in new or recently overhauled engines for break-in, other
rebuilders and manufacturers especially for engines such as the Lycoming O-320H
recommend use of an AeroShell W Oil for break-in. Operators should therefore check
with engine rebuilders or manufacturers for the correct recommendations for the specific
engine.
AEROSHELL W OILS
- Promote engine cleanliness
- Help keep engines sludge free
- Help reduce oil consumption
- Help engines reach TBO (Time Between Overhaul)
- Protect highly stressed engine parts against scuffing and wear
SPECFICATIONS
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.
| AEROSHELL OIL W100 | |
| 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 |
EQUIPMENT MANUFACTURERS APPROVALS
AeroShell W Oils are approved for use by the following engine
manufacturers:
| Textron Lycoming | 301F |
| Teledyne Continental | MHS 24B |
| Pratt & Whitney | Service Bulletin 1183-S |
| Curtiss Wright | Various Service Bulletin - refer to relevant Bulletin |
| Franklin Engines | Various Service Bulletins - refer to relevant Bulletin |
| Typical Properties | |
| SAE viscosity grade | 50 |
| Colour ASTM | 4.0 |
| Density at 15°C kg/l | 0.889 |
| Kinematic viscosity mm2/s at 100°C at 40°C |
20.2 213 |
| Viscosity Index | 110 |
| Pourpoint °C | Below -18 |
| Flashpoint Cleveland Open Cup °C |
Above 260 |
| Carbon residue % m | 0.2 |
| Total acidity mgKOH/g | <0.1 |
| Sulphur % m | 0.14 |
| Copper corrosion at 100°C | 1 |
| Ash content % m | 0.006 |
A viscosity/temperature chart is shown at the end of this section.
These products are made in more than one location and the approval status and typical
properties may vary between locations.