Automatic transmission fluid
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United States of America Patent
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Issued Date -
Oct 16, 2008
app pub date -
Feb 6, 2008
filing date -
Feb 8, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Provided are compositions for use in Automatic Transmission Fluids, and more specifically to Automatic Transmission Fluids made using Gas-to-Liquids lubricant base oils, formulated with minimal to no polymeric Viscosity Index improvers. The automatic transmission fluids disclosed herein contain a) a lubricant base oil having a Viscosity Index greater than a Viscosity Index Factor as calculated by the following equation: Viscosity Index Factor=28.times.ln(Kinematic Viscosity at 100.degree. C.)+90; b) an automatic transmission fluid additive package; and c) less than 1.0 wt % Viscosity Index improver. The automatic transmission fluid has a kinematic viscosity at -7.degree. C. of less than 300 mm.sup.2/s, and a kinematic viscosity at 100.degree. C. between 5.0 and 6.0 mm.sup.2/s.
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