Original post;
http://forums.evolutionm.net/10870477-post137.html
Quote:
Sorry for the slow response to this. I have been playing with different fluids in my personal test-mule and found the ffl fluid is not the same as the factory stuff. My trans developed a leak at the main seal where the t-case mates to the trans, and had an odd slipping issue in 4th gear when cold.
I then switched back to the factory SST fluid. The oil leak stopped and the 4th gear issue was gone.
I plan to spend more time on fluids here soon, but so far the only fluids I found which do not cause leaks and allow the clutches to work properly have been factory Nissan GT-R DCT fluid, SSP Gold, or OEM factory SST fluid.
There is something about those 3 fluids which have an ingredient we call the 'slime' coating. If you use a fluid in your SST which doesn't have this odd slime coating to it, the seals will leak. I have been unable to explain what this stuff is, but it's something the SST apparently needs. I know in the GT-R world this is not needed and many people are now using ATF in their GT-R, but the SST seems to get very upset if you do this.
For kicks I tried ATF in a known good SST and several quarts of the fluid leaked out of the seals in the trans. Again, I reinstalled the OEM SST factory fluid and the leak stopped. i never touched the seals. They leaked on their own with the new fluid I would try, then stop any time I went back to the OEM fluid.
So far I have played with ATF, engine oil, Nissan GT-R, Pentosin, SSP Gold, ffl and OEM SST fluid in the trans and all seem to make the unit run differently. Oddly enough the best fluid for shifting was straight Shell Rotella T engine oil, but everything else got pissed off with it in there.
I want to try to retest all of these fluids again with a fresh and rebuilt SST to see what happens. The SST I did these tests in previously was a factory untouched unit with a lot of miles.
Jack
JACKS TRANSMISSIONS