Originally Posted By: wirelessF
Maybe a true full-syn 100,000mi "lifetime" fluid? Unlike that Toyota WS garbage.
Most current so-called "synthetic" AT fluids contain approx. 75% GroupIII base oils. They perform well.
Interestingly,
1.) the HP specifications show some low temp performance improvement,
2.) MPG improvements range from 0.5% to 1.2%,
3.) the exemplary fluids do not show any advanced synthetic fluid chemistry involved. Of course, one can use any synthetic base oil or combination thereof as long as it meets the specifications.
.