Tractor hydraulic fluid with wide temperature range (Law180)

Details Tractor hydraulic fluid with wide temperature range (Law180) Tractor hydraulic fluid with wide temperature range (Law180)

1994-10-28

1996-05-28

Medley, Margaret

Compositions

Electrolytes for electrical devices

252 79, 208 19, C10M14514

Patent

active

055208320

ABSTRACT:
A lubricant oil composition suitable for use as a tractor hydraulic fluid which comprises (a) a lubricating oil base stock which is a blend of a major amount of paraffinic mineral oil and a minor amount of a naphthenic mineral oil, and (b) a blend of a polymethacryalte viscosity index improver having a weight average molecular weight of 25,000 to 150,000 and a shear stability index less than 5 and a polymethacryate viscosity index improver having a weight average molecular weight of 500,000 to 1,000,000 and a shear stability index of 25 to 60. The formulated oil composition has a kinematic viscosity of 8.0 to 9.0 cSt at 100.degree. C., a minimum kinematic viscosity of 7.0 cSt at 100.degree. C. after 30 shear cycles, a maximum Brookfield viscosity of 17,000 cSt at -40.degree. C. and a maximum pour point of -45.degree. C.

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