ROYCO® 555 Synthetic Helicopter Transmission & Turbine Engine Oil
Use the very best lubricating oil for your gas turbine engine or helicopter transmission. ROYCO® 555 synthetic helicopter transmission and turbine engine oil uses a blend of "hindered" poly esters and a technologically advanced additive package to improve load carrying performance, corrosion protection, anti-wear and exceptional thermal-oxidative stability. ROYCO 555 meets U.S. military specification DOD-PRF-85734 (it superseded DOD-L-85734 (AS)) and U.K. DERD.2497 and XAS-2354. So if you're looking for DOD-L-85734 oils, you've come to the right place.
It is commercially approved for use in gearboxes, transmissions and gas turbine engines built by Pratt & Whitney, Pratt & Whitney Canada, CFM International, Rolls Royce, Allison, General Electric and others, in addition to Garrett and Sunstrand accessories.
It is also approved for use by these aircraft manufacturers: Boeing Vertol, Bell Helicopter, Eurocopter/Aerospatiale, Textron, Hughes/McDonnell Douglas, Agusta, Sikorsky, MBB and Westland helicopter transmissions.
Read the ROYCO 555 MSDS document for safety information.
ROYCO 555 was specifically developed for use in high performance gas turbine engines developed during the mid 1960's for the SST and Concorde. These advanced engines required a lubricant having good high temperature stability as well as extreme pressure load carrying capability. ROYCO 555 was developed for the demands of increasingly higher power output engines that subsequently develop higher operating temperatures and loads. It was also designed to give enhanced performance in current engines.
ROYCO 555 was also formulated to meet the requirements of helicopter gearbox and transmission systems. A high load carrying oil such as ROYCO 555 is necessary to meet the load requirements and reliability demands of those systems. More recently with the need to transmit more power and higher loads through helicopter gearbox and transmission systems, extensive evaluation by helicopter airframe manufacturers has demonstrated this improved load carrying ability which has resulted in improved performance - particularly by increased time between overhaul (TBO.) This oil should only be used in applications where synthetic oils have been specified or in systems expressly designed for synthetic lubricants.
NOTE: ROYCO 555 should not be used with silicone-based elastomers.