Varace Air Corporation
Products | Piston Engine Oils | AeroShell Oil W120

AeroShell Oil W120


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.


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.


  • 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


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 60
British Approved J-1899
SAE Grade 60
French (AIR 3570
Grade SAE 60)
Russian --
NATO Code O-128 Obsolete
Joint Service Designation OMD-370


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 60
Colour ASTM 5.0
Density at 15°C kg/l 0.894
Kinematic viscosity mm2/s
at 100°C
at 40°C

Viscosity Index 120
Pourpoint °C Below -18
Flashpoint Cleveland
Open Cup °C
Carbon residue % m 0.25
Total acidity mgKOH/g <0.1
Sulphur % m 0.18
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.