LUBRICATlNG OILS

LUBRICATING OIL FOR DE HAVILLAND GIPSY ENGINES

The Gipsy range of de Havilland piston engines is approved for operation in Arctic and Temperate conditions on lubricants complying with British Ministry of Supply Specification D.Eng.R.D.2472, and in Tropical conditions on lubricants complying with de Havi1land Specification DHE.227.

The appropriate grade of oil must be used according to the prevailing conditions and the following grades of oil, certified as complying with these requirements, are, until further notice, suitable for use in de Havilland Gipsy engines in appropriate climatic and operating conditions.

Conditions of Operation	"Arctic" (Below 0 deg. C.)	" Temperate " (0-30 deg. C.)	"Tropical" (Above 30 deg. C.)
Specification	D.Eng.R.D.2472.A/O	D.Eng.R.D.2472.8/O	deHavilland DHE.227
The following grades comply with the above specifications.
Esso Petroleum Co.	Esso Aviation Oil 80	Esso Aviation Oil 100	Esso Aviation Oil 120
Shell.:.Mex Ltd	Aeroshell 80	Aeroshell 100	Aeroshell 120
Regent Oil Co.	Caltex Aircraft Engine Oil 80	Caltex Aircraft Engine Oil 100	Caltex Aircraft Engine Oil 120
Vacuum Oil Co.	Mobiloil Aero, grey band	Mobiloil Aero, red band	Mobiloil Aero, green band
C. C. Wakefield & Co.	Castrolaero " A "	Castrolaero " B ''	Castrolaero " C "

The conditions of operation given above can, of course, act only as a general guide, for, as will be readily appreciated, the wide variations of temperature that may occur in one locality even during a single day would make impossible a literal application of the recom­ mendations. In general, however, if it is expected that the temperatures specified for the use of tropical or arctic grades of oil will be met at ground level during the normal course of opera ion of the aircraft at that particular time, then the appropriate grade of oil should be used.