97 M6 fluid debate
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Joined: Aug 2001
Posts: 5,364
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From: King George VA
AMSOIL vs Havoline ATF Viscosity Testing
For the original poster, these AMSOIL fluids are recommended by AMSOIL for Dexron III applications and seem to perform well with paper blocker rings. Mine is an 02 Z06, so can't comment directly on its performance with the paper blocker rings, but lots of guys on the forum are using the AMSOIL fluids with no problems that I'm aware of.
AMSOIL ATF (stock code ATFQT)
AMSOIL Torque-Drive Synthetic Transmission Fluid (stock code ATD1G)
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C66 Racing #66 NASA ST2, SCCA T2
AMSOIL Dealer (Forum Vendor)
AMSOIL Preferred Customer Program (Members buy at Wholesale - a savings of about 25%)
Tech Contributor
Joined: Dec 1999
Posts: 32,910
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
I cant comment on the oxidation issue but, I can shed some light on what I saw when I changed the OEM tranny fluid in my 98 Coupe MN6 after 50,000 miles.
The old fluid looked like metal flake paint.
It had lots of wear particles in it. My thoughts are that the wear particles cause the synchros and blocker rings to not work correctly and you get the rough shifting. As soon as I changed the fluid, it shifted excellent.
I changed the fluid in my 02 Z after 27,000 miles and the fluid didn't have hardly any wear products but the fluid was a little darker than I thought it should be. The new Mobil 1 Synthetic ATF worked well in that tranny also!
Bill
The old fluid looked like metal flake paint.
It had lots of wear particles in it. My thoughts are that the wear particles cause the synchros and blocker rings to not work correctly and you get the rough shifting. As soon as I changed the fluid, it shifted excellent. I changed the fluid in my 02 Z after 27,000 miles and the fluid didn't have hardly any wear products but the fluid was a little darker than I thought it should be. The new Mobil 1 Synthetic ATF worked well in that tranny also!
Bill
