75w90 is okay in the transmission and as MR 325 states it may make a worn transmission a little quieter. However, in colder climates shifting may be difficult until the transmission warms up a good bit. ATF is a bit thinner and it has less change in viscosity with temperature. As far as its lubricating properties, remember that an automatic transmission has about as many gears to lubricate as a manual.
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manual gearbox leaks- cheaper alternative to redline MTL
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I use MTL in my G240 but the 3rd gear syncro has always been slow on downshift (upshifts flawlessly..go figure).
Would 75-90 help ?Seat Shocks....I have passed the baton to John Christy from Ninestitch. Email John or Garrett at ninestitch1@gmail.com
https://www.r3vlimited.com/board/sho...86#post4944786
Alice the Time Capsule
http://www.r3vlimited.com/board/showthread.php?t=360504
87 Zinno Cabrio barn find 98k and still smells like a barn. Build thread http://www.r3vlimited.com/board/show...20#post3455220
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Originally posted by jeffnhiscars View PostI use MTL in my G240 but the 3rd gear syncro has always been slow on downshift (upshifts flawlessly..go figure).
Would 75-90 help ?The car makes it possible, but the driver makes it happen.
Jim Levie, Huntsville, AL
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Originally posted by jlevie View PostMaybe, but learning to double clutch downshift will work even better.
Either way its a work around until I properly address the problem and I think I prefer the passive option (gear oil) rather than changing by driving style.Seat Shocks....I have passed the baton to John Christy from Ninestitch. Email John or Garrett at ninestitch1@gmail.com
https://www.r3vlimited.com/board/sho...86#post4944786
Alice the Time Capsule
http://www.r3vlimited.com/board/showthread.php?t=360504
87 Zinno Cabrio barn find 98k and still smells like a barn. Build thread http://www.r3vlimited.com/board/show...20#post3455220
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This is an old thread, I know, but it is interesting to me that no one has mentioned GL4 vs GL5. In my experience, it is very difficult to find a GL4 gear oil these days. So if you get 75w-90, I'll bet it's a GL5 oil which, I have read, could be harmful to our trannys.
I have been using this for years and it seems to work okay. http://www.crcindustries.com/ei/prod...spx?id=SL24239
That said, I've been looking for alternatives lately. I tried Redline once and it all leaked out and ruined my tranny. I got another one out of the junk yard and replaced the seals but am not ready to go back to Redline. It's def thinner than the CRC stuff I'm using and I live in So Cal so it works fine.
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