Royal Purple MTF
Thread Starter
Safety Car
Joined: Apr 2012
Posts: 4,077
Likes: 239
From: Houston TX
Royal Purple MTF
So We drained out the factory M6 transmission fluid after 5000 miles. Installed all new fresh quarts of Royal Purple MTF and now it shifts like I installed rocks in the gear box. Now can someone tell me why this happens? All fresh total synthetic fluid and it grinds like no tomorrow. It was so much smoother with the old 5K stuff in there. I guess I'll switch to Aimsoil tomorrow as soon as I can order.
If anybody can tell me why this happen that would be great.
Thanks
If anybody can tell me why this happen that would be great.
Thanks
Melting Slicks
Joined: Dec 2006
Posts: 2,694
Likes: 106
Yep, fluid should be Dexron-III compatible, and Royal Purple Synchromax it's not. I put that on an LS2 GTO once, and didn't grind, but also made things worse than the non-synthetic stock. I recently switched to Amsoil TorqueDrive Dexron-III fluid on the '12 GS, and although it didn't get rid of the 1-2 crunch when cold (as expected), it was an improvement over the stock fluid, even with just 3K miles. Whatever you use, just make sure it's Dexron-III (not IV) compatible. Good luck.
Instructor
Joined: Mar 2013
Posts: 159
Likes: 0
From: Nashville Tennessee
I just put Synchromax in mine.... no problems.... and it says it is for manuals where an ATF spec fluid is called for... I looked at user reviews... the Amsoil had a bunch of complaints... the synchromax was overwhelmingly positive...
Thread Starter
Safety Car
Joined: Apr 2012
Posts: 4,077
Likes: 239
From: Houston TX
Well I don't get it. The Synchromax is supposed to be used in replacement for the Dexron. Where did you see these reviews?
Instructor
Joined: Mar 2013
Posts: 159
Likes: 0
From: Nashville Tennessee
just looked at the reviews.....
I had bought the RP ATF and then learned about the snychomax... and then called RP and asked them... they said I could used either but the synchromax was the better choice.
Instructor
Joined: Aug 2007
Posts: 218
Likes: 0
From: St. Peters Mo
The link below has some very interesting info on Manual trans fluid, it was written by a professional tribologist and he knows his stuff. It gives recommended substitutes for atf in manual trannys
http://www.bobistheoilguy.com/forums...82#Post1231182
Last edited by Braumeister; Apr 23, 2013 at 11:51 AM. Reason: add info
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Team Owner
Joined: Sep 1999
Posts: 41,732
Likes: 1,718
From: Springfield MO
So We drained out the factory M6 transmission fluid after 5000 miles. Installed all new fresh quarts of Royal Purple MTF and now it shifts like I installed rocks in the gear box. Now can someone tell me why this happens? All fresh total synthetic fluid and it grinds like no tomorrow. It was so much smoother with the old 5K stuff in there. I guess I'll switch to Aimsoil tomorrow as soon as I can order.
If anybody can tell me why this happen that would be great.
Thanks
If anybody can tell me why this happen that would be great.
Thanks
Premium Supporting Vendor
Joined: Aug 2001
Posts: 5,364
Likes: 38
From: King George VA
PM I received yesterday on this ATF: "... the tranny fluid made a big difference in my car.
"
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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%)