Quote:
Originally posted by v8Toilet
I just totally exchanged my transmission fluid with 16 quarts of Mobil 1 synthetic automatic transmission fluid at 39,466 miles and did it myself. I'm always very skeptical about the claims people make about automotive products (have seen so much crap and scams) and I try to use as many facts as I can when I make a claim.
My transmission has always shifted a little firmly especially the 1-2 shift. It has never been harsh like some people have claimed. It also seemed to be getting a little harsher with age but I can’t say for sure. I can't back this up with any factual data but after switching over to synthetic fluid I can say that the transmission does shift more smoothly.
Here is what I noticed most. When I first drive it in the morning the transmission shifts quicker than it used to or it shifts more like it did with the regular fluid when it was warm. There isn’t much difference between hot and warm anymore. I have put over 100 miles on it now and I have tried but I can't get the transmission to bump into gear like it did before. The transmission hasn't done it once. It seems to work more smoothly now.
I think the transmission shifts quicker when it is cold because the synthetic fluid flows better in low temperatures. I hope that the transmission shifts are less firm when warm because the better flow characteristics of the synthetic fluid make it easier for the transmission to control line pressure. I don't want a clutch pack to be slipping more than normal as they engage because the fluid is slicker.
When I felt the fluid between my fingers it did feel very slick.
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The cold flow will make somewhat of a difference, but what will make a much bigger difference is that when it's warm (actually hot) the fluid will thin less than regular fluid. So less downshifting is needed (it's more efficient).