These oils are intended primarily for the lubrication of plain bearings, roller bearings, parallel shaft and bevel gearing. They are suitable as multipurpose lubricants in systems not subject to shock loading and which do not require extreme pressure performance. They are used in applications using splash, bath and ring oil arrangements and all other application methods involving pumps, valves and auxiliary equipment. They are mended for use in hydraulic systems where higher viscosity oils are specified.

• Moderate duty spur, bevel, helical and herringbone gear units
• Circulating systems
• Mobil DTE Oil Extra Heavy and BB can also be used in hydraulic systems employing gear, vane, radial and axial piston pumps where anti-wear hydraulic fluids are required and clearances are relatively large
• Certain compressors and vacuum pumps handling air, natural gas and inert gases provided the discharge temperatures do not exceed 150°C

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Typical Properties

MOBIL DTE Oil Double Letter Series	Mobil DTE Oil Extra Heavy	Mobil DTE Oil BB	Mobil DTE Oil AA	Mobil DTE Oil HH
ISO Viscosity Grade	150	220	320	460
Viscosity, ASTM D 445
cSt @ 40ºC	146	218	325	436
cSt @ 100ºC	14.4	18.8	24.4	29.4
Viscosity Index, ASTM D 2270	96	96	96	95
Pour Point, ºC, ASTM D 97	-21	-18	-12	-15
Flash Point, ºC, ASTM D 92	272	284	286	288
Density @15ºC, ASTM D 1298, kg/l	0.89	0.89	0.90	0.90
Demulsibility for non-EP oils, ASTM D2711, ml free water	38	36	39	35
Water separability, ASTM D 1401, Min. to 40/37/3 ml emulsion @ 82ºC	20	20	20	20
Rust Prevention, ASTM D 665
Distilled Water	Pass	Pass	Pass	Pass
Sea Water	Pass	Pass	Pass	Pass
Copper Corrosion, ASTM D 130 hours @ 100ºC	1A	1A	1A	1A
FZG Gear Test, DIN 51354, Failure Stage	12	12	12	12