Gm Global Technolgoy Operations, Inc.

Roy Fewkes

James L Linden

Jill M Cummings

Michael B Glasgow

Joan M Petit

Christopher C Morgan, Jr

Diana Foghel

The present invention provides a composition for a power transmitting fluid that has improved fuel economy, aeration, and cold temperature performance. Additionally, the composition maintains viscosity at higher temperatures that are in line with the viscometrics of current known automatic transmission fluids. The composition preferably comprises an additive and a base stock having a polyalphaolefin blend.

Power transmitting fluid composition

A test apparatus for testing fluid seals within an aerated fluid includes a container and a fluid located within the container. A plurality of seal coupons are submerged within the fluid in the container. An air supply is connected to the container to aerate the fluid within the container. Testing the seal coupons includes flowing air from the air supply through the fluid to contact the seal coupons. After the air has contacted the seal coupons then the plurality of seal coupons are removed from the fluid. A value for at least one characteristic of the seal coupons is then compared with a standard value.

Apparatus and method for a seal immersion test with aerated fluid

A test apparatus for measuring the air entrainment characteristics of a fluid includes a reservoir for containing the fluid, an aerator apparatus to cause air entrainment of the fluid, and a density meter to measure the effects of air entrainment on fluid density. The test apparatus enables in-situ measurement of the transient air entrainment behavior of the fluid. A corresponding method is provided.

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Farmington Hills, MI, United States of America

Roy Fewkes