tranmission fluid questions
Thread Starter
Burning Brakes
Joined: Oct 2009
Posts: 1,013
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From: NJ: the garbage state
tranmission fluid questions
i have an 09 coupe manual 6spd. from my research i see either redline, royal purple, or amsoil is recommended for the transmission fluid change. i recently changed from the stock factory fill to royal purple synchromax as i could not find amsoil or redline in my area. i now get a grinding on 5th gear it seems when not fully warmed up. i think it shifts better in the other gears compared to stock but that grinding really irks me especially after spending 70 bucks to change perfectly good fluid. obviously there will be those who want to riducule me for changing fluid but does anyone share a similar experience? will amsoil or redline cure this issue and is it a problem to do a simple drain and re-fill at this point with another product even through royal purple was introduced into the system?
Race Director
Joined: Sep 2000
Posts: 11,143
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From: Missouri City, TX
Redline and AMSOIL will be compatible with the RP as all are full synthetics. I don't know if a change to another make fluid will solve your problem. I have used both REDLINE D4-ATF (01Z06) and AMSOIL ATF (06Z06) without seeing any improvement in shifting compared to the factory fluid. However, if you do want to try a non-RP product, I would recommend the following: AMSOIL Torque Drive DEX III ATF product in 1 gal (4qts) jug which I will used in my ZR1 at 20k or so miles. You can order from this webstore site:
http://www.amsoil.com/shop/by-produc...?code=ATD1G-EA
http://www.amsoil.com/shop/by-produc...?code=ATD1G-EA
Last edited by GOLD72; Aug 8, 2013 at 01:10 PM.
Race Director
Joined: Sep 2000
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From: Missouri City, TX
Team Owner
Joined: Sep 1999
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From: Springfield MO
i have an 09 coupe manual 6spd. from my research i see either redline, royal purple, or amsoil is recommended for the transmission fluid change. i recently changed from the stock factory fill to royal purple synchromax as i could not find amsoil or redline in my area. i now get a grinding on 5th gear it seems when not fully warmed up. i think it shifts better in the other gears compared to stock but that grinding really irks me especially after spending 70 bucks to change perfectly good fluid. obviously there will be those who want to riducule me for changing fluid but does anyone share a similar experience? will amsoil or redline cure this issue and is it a problem to do a simple drain and re-fill at this point with another product even through royal purple was introduced into the system?
The Mobil1 is a little better when cold then the factory fill, but seems to be about the same when warmed up.
Premium Supporting Vendor
Joined: Aug 2001
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From: King George VA
Traded several PMs on this topic with the OP, but for others reading the thread and interested in trying the Torque Drive ATF, more than happy to get AMSOIL products for forum members at dealer wholesale pricing, about 25% below retail, via the AMSOIL Preferred Customer Program. Drop me a PM if interested.
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AMSOIL Dealer (Forum Vendor)
AMSOIL Preferred Customer Program (Members buy at Wholesale - a savings of about 25%)
C66 Racing #66 NASA ST2, SCCA T2
AMSOIL Dealer (Forum Vendor)
AMSOIL Preferred Customer Program (Members buy at Wholesale - a savings of about 25%)
Melting Slicks
Joined: Dec 2006
Posts: 2,694
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OP, 5th has always been super notchy on these trannies, and mine ('12 GS here) is no exception. Not particularly satisfying to shift into, but at least never a grind in my case. If there's a grind, then something is not right, and I doubt fluid has anything to do with that, especially since it's the only one. Having said that, I also didn't like RP Synchromax on the T56, so will never use it again. I used Amsoil TorqueDrive on the GS to try to cure a cold 'crunch' on the 1-2 and 2-3 shifts, but didn't help (I went around that issue by pausing those shifts for 2 miles or so). I noticed a very slight difference when hot, but nothing to write home about. I also wanted the non-synthetic fluid out of there, along with any break-in crap in the fluid, so replaced it at 3K miles, along with the differential oil (Dexron LS), which cured the grinding at full lock. Good luck with your issue.
Last edited by JCtx; Aug 11, 2013 at 01:27 PM.
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From: Missouri City, TX