Transmission fluid swap - Ford Mustang Forum
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post #1 of 4 (permalink) Old 10-25-2013 Thread Starter
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Transmission fluid swap

I just returned from a 1400 mile trip with my car. The car has 6000 miles on it. Its a 2012 Gt 6mt and I have had it for 16 months now and I am the original owner. On my trip I did notice a little whine on the highway and this was with the radio down and the windows up. This could have been from the mgw shifter that was just installed on this trip. I do believe this was because of the thinner QDC fluid that came from the factory. I have never had any problems with this transmission and it shifts just fine But I am concerned about long term effects on this transmission on the thinner fluid. I know there has been many treads and debates on which fluid to go with.

Has anyone used Redline MT-85 this seems like a happy medium between MTL and MT-90?

I haven't heard to much about Royal Purple synchromesh?

Thanks for the help everyone.

2012 GT 5.0 Ingot Silver 6M,401A, RR sensing sys/security pkg.,19" painted alum wheels,GT coupe accessory Pkg 5, Ford Racing SVT Sport axle-back mufflers w/o resonators, MGW shifter, Airaid cai/Steeda 93 tune, Boss quad exhaust.

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post #2 of 4 (permalink) Old 10-25-2013
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I have used Royal Purple for years and had great service from it.I do the rear end,trans,engine,power steering and gonna do the brake fluid soon as i get a chance.

Cherish those around you,for at the blink
of an eye,they can be gone.

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post #3 of 4 (permalink) Old 10-25-2013
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I changed mine to Redline and noticed a significant difference. Shifts were smoother and faster than before. I already had a Short Shifter and bracket installed. I was also surprised at the ugly color and odor of the factory fill. Glad to get that out of there!

2013 GT Track Pack, Airaid CAI, BBK Throttle Body, Magnaflow Competition Catbacks, Eibach Pro Street S, Whiteline Watts Link, Trucarbon Spoiler, Ford Racing Short Shifter, Hotchkis Sub Frame and K Member Brace, Boss Brake Cooling Ducts, Stop Tech Slotted Rotors, Hawk Race Pads, Shelby Rear Strut Tower Brace, Steeda X Brace, Rear Seat Delete, Stillen Splitter, BAMA Tune.
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post #4 of 4 (permalink) Old 10-25-2013
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You could keep the QDC fluid type and add the X-18.

Or go with the BG Synchromesh II. Some really like this. But if going this route, change it often. I hear it begins to degrade after 10K.

But I am no expert.

Me? I fretted and worried and obsessed over what oil to switch to, even ordered some MTL that I have sitting in the garage.

In the end, I refilled with QDC with 1200 miles on the car.

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