Transmission Fluid Issue? Amsoil 80W90. Gears won't engage, shifter heavy when cold?

MX52Z · 01-10-2013, 04:16 PM

"Motorcraft Full Synthetic Manual Transmission Fluid XT-M5-QS" from Germany which is a 75w90 GL-4. It's very popular with the Miata/Mazdaspeed and Focus crowd amongst others. Has an enormous following and positive results. Probably the best GL-4 fluid around.

Just Google it for more info and testimony. It's one of those "ad nauseum" topics that is so well established, forums hate seeing new threads about it.

It has an immediate effect with many people having notchiness problems but it is also a lifetime fluid meaning simply that you don't flush it out after a few thousand miles. You leave it in for good and it keeps getting better over time.

I have it in my Miata 6-speed which shares the same Aisin tranny as the S2000 and never looked back. I just got my Z recently and am going with the Motorcraft in that too. I'm not affiliated with Motorcraft, haha, just swear by it from experience.

Info:
https://www.fcsdchemicalsandlubrican...ission%20Fluid

01-10-2013, 04:16 PM	#1 (permalink)
MX52Z Enthusiast Member Join Date: Dec 2012 Location: Port Charlotte, FL Posts: 471 Drives: Z'less por ahora Rep Power: 13	"Motorcraft Full Synthetic Manual Transmission Fluid XT-M5-QS" from Germany which is a 75w90 GL-4. It's very popular with the Miata/Mazdaspeed and Focus crowd amongst others. Has an enormous following and positive results. Probably the best GL-4 fluid around. Just Google it for more info and testimony. It's one of those "ad nauseum" topics that is so well established, forums hate seeing new threads about it. It has an immediate effect with many people having notchiness problems but it is also a lifetime fluid meaning simply that you don't flush it out after a few thousand miles. You leave it in for good and it keeps getting better over time. I have it in my Miata 6-speed which shares the same Aisin tranny as the S2000 and never looked back. I just got my Z recently and am going with the Motorcraft in that too. I'm not affiliated with Motorcraft, haha, just swear by it from experience. Info: https://www.fcsdchemicalsandlubrican...ission%20Fluid Last edited by MX52Z; 01-10-2013 at 04:27 PM. Reason: Added link

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Red Line MT-85 Transmission Fluid - Now Available at Z1	Chuck@Z1	Z1 Motorsports	8	08-03-2014 07:35 PM
Transmission problem (?) after a transmission fluid change	EWarren	Engine & Drivetrain	7	07-28-2014 11:44 AM
Amsoil transmission oil, disappinting	cossie1600	Engine & Drivetrain	10	05-14-2012 10:23 PM
Notchy 3rd and 5th Gears Manual Transmission	Master_Ly	Engine & Drivetrain	23	09-08-2011 07:05 AM
Manual Transmission Engage Height	cames4	Nissan 370Z General Discussions	15	08-29-2010 11:19 PM