AeroShell Turbine Oil 555 was specifically developed to meet the high temperatures and load carrying requirements of SST engines and the DEF STAN 91-100 (formerly DERD 2497) and XAS-2354 specifications. AeroShell Turbine Oil 555 was also designed to give enhanced performance in current engines.

More recently with the need to transmit more power and higher loads through helicopter transmission and gearbox systems (many helicopters use a synthetic turbine engine oil in the transmission/gearbox system) it has become apparent that the use of a very good load carrying oil, such as AeroShell Turbine Oil 555 is necessary. This in turn has led to the development of a U.S. Military Specification, DOD-L-85734, which covers a helicopter transmission oil against which AeroShell Turbine Oil 555 is fully approved.

AeroShell Turbine Oil 555 contains a synthetic ester oil and should not be used in contact with incompatible seal materials and it also affects some paints and plastics. Refer to the General Notes at the front of this section for further information.

AEROSHELL TURBINE OIL 555 SPECIFICATIONS

• U.S. Approved DOD-L-85734
• British Approved DEF STAN 91-100
  Note: both UK and US production are manufactured to the same formulation.
• NATO Code O-160
• Joint Service Designation OX-26
• Pratt & Whitney Approved 521C Type II
• General Electric Approved D-50 TF 1
• Allison Approved EMS-53 (Obsolete)

This material has an initial shelf life of 6 years from the date of manufacture. This can be extended via a re-test which will be valid for an additional 3 years.