Aeroshell Piston Engine Oil
W80 and W100
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 are available in different viscosity grades:
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
Specifications
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.
| GRADE |
W80 |
W 100 |
| U.S. |
Approved J-1899 SAE Grade 40 |
Approved J-1899 SAE Grade 50 |
| British |
J-1899 SAE Grade 40 |
Approved J-1899 SAE Grade 50 |
| French |
(AIR 3570 Grade SAE 40) |
(AIR 3570 Grade SAE 50) |
| Russian |
MS-14 |
MS-20 |
| NATO Code |
O-123 Obsolete |
O-125 Obsolete |
| Joint Service Designation |
OMD-160 |
OMD-250 |
( ) indicates the product is equivalent to specification.
Equipment Manufacturer 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 |
Service Bulletins – refer to relevant Bulletin |
| Engines |
Service Bulletins – refer to relevant Bulletin |
Typical Properties
| Grade |
W80 |
W100 |
| SAE viscosity grade |
40 |
50 |
| Colour ASTM |
4.0 |
4.0 |
| Density @ 15°C kg/l 0.887 0.892 0.896 0.898 |
0.887 |
0.889 |
Kinematic viscosity mm2/s @ 100°C
Kinematic viscosity mm2/s @ 40°C |
14.5
126 |
20.2
213 |
| Viscosity Index |
115 |
110 |
| Pourpoint °C |
Below –22 |
Below –18 |
| Flashpoint Cleveland Open Cup °C |
Above 240 |
Above 260 |
| Carbon residue % m |
0.3 |
0.2 |
| Total acidity mgKOH/g |
<0.1 |
<0.1 |
| Sulphur % m |
0.13 |
0.14 |
| Copper corrosion @ 100°C |
1 |
1 |
| Ash content % m |
0.006 |
0.006 |
These products are made in more than one location and the approval status and typical properties may vary between locations.
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