AeroShell Oil W 120

Standards & approvals

• SAE J1899

  Official approval

  Aircraft piston engine oil, ashless dispersant type

  SAE standard for mineral aircraft piston engine oils with ashless dispersants.

• NATO Code O-128

  NATO Code O-128 (obsolete) — aviation piston-engine oil

  NATO code for an aviation piston-engine oil (obsolete).

• 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.

• MIL-L-22851D

  US military specification for aircraft piston engine oil

  Former US military specification for aircraft piston engine oils, later superseded by SAE J1899.

Specifications

Brand

Shell

Range

AeroShell

Category

Aviation piston engine oils

Viscosity

SAE 60

Manufacturer code

001A0075

Availability

On request

Typical characteristics

Manufacturer's description

AeroShell Oil W 120 is the SAE 60 ashless dispersant oil of the AeroShell W range for four-stroke aircraft piston engines, including fuel-injected and turbocharged engines. It is a blend of non-metallic additives and a high viscosity index base oil (115), giving stability, dispersancy and anti-foam performance without metallic ash deposits that can cause pre-ignition. Viscosity 270 mm²/s at 40 °C and 24.8 mm²/s at 100 °C; the 120 suffix is the viscosity in SSU at 210 °F. Most radial-engine operators use it in hot-weather operation. Approved to SAE J-1899 grade 60; NATO O-128 (obsolete), OMD-370, Textron Lycoming 301F, Teledyne Continental MHS 24B and Pratt & Whitney SB 1183-S are also listed. Not recommended for automotive engines.

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 °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