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Royal Purple Synchromax Manual Transmission Fluid

Item 45004
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      Review & Installation Video

      If you have a manual transmission in your 1979 and newer Mustang, and are looking to promote smoother shifting and better wear protection, then you should check out a quart or two of the Royal Purple Synchromax manual transmission fluid. Now, this extremely popular and highly rated fluid here on the site will work with any manual transmission in your Mustang, but is not advised for automatic transmissions or rear ends. Your price point per quart will be around 15 bucks, while the install will vary depending on your car, but let's call it one out of three wrenches on the difficulty meter, with a little bit more on that topic later in the video. So, T5, T45, 3650, 6060, T56 or MT82, it doesn't matter, the Royal Purple Synchromax we are talking about here today will be for you. Now, the Synchromax is a synthetic transmission fluid which is designed to improve shifting and reduce gear noise through Royal Purple's proprietary Synerlec technology. And this is one of those products where, guys, I really encourage you to check out or read up on some of the 100 plus, 5 star reviews on the site, because, listen, I can sit here and tell you what's in this stuff all day long and why it's so great, but it's always better to hear from different Mustang owners out there who've actually filled their transmission up with this stuff and it gets them real-world feedback. But either way let's get back to the Synchromax here. And aside from the smoother and quieter operation, Royal Purple also states that their additives in this Synchromax will help protect some of the softer metals typically found in manual transmissions, and more specifically, their synchronizers. Also worth noting is that cold weather owners might be drawn to this fluid a little bit better because of the lower operating temperature, which will help eliminate some of that notchiness on some of the colder mornings. Now, the amount of fluid needed will differ from trans to trans, but you're gonna be looking at three to four quarts here depending on your setup, and for that I would recommend to check out your owner's manual at the end of the day as it does differ a bit to bit from transmission. Now, as far as additives are concerned, well, that's another area that will differ from setup to setup. And I will say, most cars will be fine just using the fluid itself here, but again, check your manual, see if one is needed just to be on the safe side. Now, filling the trans can be done a few different ways, but I will say that using some sort of pump, whether it be vacuum or handheld, will certainly make your life easier compared to just dumping it in using some crazy long funnel. Either way, guys, let's call it one out of three wrenches on the difficulty meter here, and about 30 minutes to an hour of your time to get the old fluid drained and the new fluid in place in your transmission. So, wrapping up this short and sweet video, if you're looking for a very popular fluid to fill the manual transmission in your '79 and newer Mustang, then check out a few quarts of the old Synchromax here from Royal Purple, right here at

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Smoother Shifts
      • Better Transmission Performance
      • Superior Protection
      • Full Synthetic
      • Resists Breakdown
      • 1-Quart Bottle


      Protection. Royal Purple Synchromax® is a full synthetic transmission fluid that provides superior wear protection for your Mustang's drivetrain. Synchromax® is formulated with Royal Purple's synthetic, proprietary Synerlec® additive technology, which offers improved shift quality over a wide temperature range and reduced gear noise. Use Royal Purple Synchromax on your Mustang's next fluid change for the cheapest insurance you can get against future transmission breakdowns.

      Better Shifts. If your transmission is notchy, rough, or loud but is mechanically fine, a fresh fill of Synchromax® can help smooth things back out. If you have a new Mustang or transmission, changing your fluid to Synchromax can keep your transmission working better - both now and later.

      Protects Internal Components. Synchromax® is fully compatible with all types of friction materials and offers excellent corrosion and oxidation protection without affecting the soft metals commonly found in manual transmission synchronizers.

      Application. Synchromax® is recommended for manual transmissions that specify an automatic transmission fluid or motor oil. Please note the T-45/T-3650 will take approximately 3.25 quarts to fill the transmission after a full transmission fluid flush.

      Fitment: 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020

      MPN# 01512

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (100+)

      Write a Review

      Ratings Summary

      4.8 out of 5 overall rating from 100+ customers

      • March 31, 2020

        5 2015 EcoBoost - Mud!

        I can only compare this to the stock fluid in the MT82. Difference is night and day. It’s insane how much difference some fluid can make in the smoothness and feel of your shifts, but it really makes a huge improvement.

        Helpful (0)
      • March 19, 2020

        5 2007 GT - sean

        Improved shifting a lot

        Gears were sticking when the transmission heated up on a long road trip and on the track. Now it shifts much better.

        Helpful (0)
      • March 15, 2020

        5 2014 GT - 7MPEST

        2014 GT

        Great product! Have been running it in my car for a month. Replaced my clutch kit to include my clutch line and changed the trans fluid as well. Really enjoy all the improved benefits.

        Helpful (0)
      • March 09, 2020

        5 2013 GT - CodyKyle210

        Best stuff for your mt82

        Smooth and clean shifts now. Definitely needed it.

        Helpful (0)
      • March 07, 2020

        5 2015 EcoBoost - razor353

        Just what the doctor ordered

        My MT82 came filled with DCT fluid and later they added an additive used in the previous generation that didn't do anything to improve shifts. This took care of all the issues, no more rough shifting, kicks, noises or problems. It shifts smoothly. They should come filled with this out of the factory.

        Helpful (1)
      • January 13, 2020

        5 2011 GT - lindsayann16

        Great product.

        Works great in my MT82. It shifts much more smoothly and operates much better at lower temperatures than it did with factory weight fluid.

        Helpful (1)
      • December 03, 2019

        2 2016 GT - MitchellS

        not good for mt82 trans

        listen the oil does every thing they say had it 2 years i track my car and this oil foams up and clogs the trans breather valve when it drys then you get trans leak pretty bad this was diagnosed through ford performance as the dealer could not figure it out. use the recommended product and change more often or possibly go to red line (if the additive packs dont foam up. mine was still under warranty I got lucky dont make the same mistake with the mt82 my gt is 2016 with 20 k and 18 track days

        Helpful (1)
      • November 25, 2019

        5 2019 GT - Anonymous

        Well, it does what they say!

        noticed the the MT 82 trans on the Mustang GT is a little noisy and this is on my car with 1700 miles on it. So took a chance and changed out the fluid with the Royal Purple product. Have to say it does run smoother on shifts and at low speed around the neighborhood is quieter. Turned on the quiet exhaust mode to really listen and yep less whine. For those of you thinking about doing the change of fluid, I did a setup that might make it easier to fill then the lame 1oz pumps on the floor. Just get a piece of clear tubing about 5 foot. Take one end and put it in the fill hole take the tubing and zip tie it to the exhaust( yes it has to be cool, duh) this will anchor the hose into the fill hole. The other end jam on the bottle tip after nipping off the tip and just invert the bottle and hold up at your side. Gonna need to pop a hole in the base of the bottle once inverted to allow air to fill and let the fluid out. all said and done it took less then 20 mins to drain and fill.

        Helpful (1)
      • November 24, 2019

        5 2013 GT - Chris

        Ease of mind

        13 Gt VMP gen 2R 50k ,miles Replaced the oem trans fluid with the royal purple due to reviews / reputation. Was easy to access with allen wrench / fluid pump. Wouldn't recommend trying it with out some sort of pump due to the tightness of the fill location. Overall feels smoother than before at low - mild rpms, Mid to higher rpm on occasion have clunky feel. Satisfied

        Helpful (2)
      • September 22, 2019

        5 2013 GT - Moosehead

        Helpful (1)

      Questions & Answers (49 answers)

      5 Top Rated Questions

      Hello good evening! How many quarts for a 2014 manual GT 5.0

      • The 2014 Mustang GT 5.0L will take 2.7 quarts of transmission fluid.

      Helpful (10) nooby I NEED a manual transmission oil change in my 2006 S197 GT, but I need to know how much of this do I need for a full top off after I drain it and how to fill it...can I fill it from the shifter and unscrew the knob and poor it in? or Do I have to fill it from the fill hole?

      • The 2006 Mustang GT equipped with a manual transmission will require 3.25 quarts of transmission fluid. After you drain your transmission, you will need to refill it from the fill hole located on the transmission.

      Helpful (5)

      how many quarts of transmission fluid do i need for my 1998 t-5 transmission?

      • you need 3 quarts. you can refer to your owners manual.

      Helpful (5) Show 2 more answers

      How many quarts for the t 45 in my 99 cobra?

      • The T-45/T-3650 transmission will take approximately 3.25 quarts to fill the transmission after a full transmission fluid flush.

      Helpful (3)

      Would it be okay to mix this product with Slick 50 manual transmission formula? 1 bottle = 10 oz dose.

      • We do not recommend mixing additives with the Royal Purple Synchromax Manual Transmission Fluid.

      Helpful (2)
      10 More Questions
      Is this safe for use in the MT82 2011+ GTs? Is this safe to use in the manual MT82 transmission for 2011+ GTs? I ask because I have heard its not good to change fluids outside of Motorcraft but I used this in my 01 GT and it made a huge difference in shift performance and I might have even picked up a few ponies 3 answers
      How many bottles do I need for a 2014 mustang v6 6 speed? thank you 1 answer
      How many bottles do I need for my 2015 ecoboost mustang? 1 answer
      I have a 2017 GT, with MT82. Should I use the Motocraft XL-18 additive when I perform the fluid change? 1 answer
      Would this fix...? I'm long over due for a transmission fluid change and most likely going to buy this fluid, but I was wondering if this would fix a noise I have in 5th gear, (rubbing noise that is not constant but more of a lopping pattern noise) Keep up the awesome service AM! 5 answers
      Can i find here the ( MSDS ) material safety data sheet document for this item ? 0 answer
      Do I need to add any friction modifier with this transmission fluid? 0 answer
      Hi I just wanted to know if this can help with my 5th gear grinding? And how many quarts for my 2012 GT thanks 1 answer
      The 3650 in my '03 GT checks off all of the boxes listed in the product description so I'm definitely interested in trying this out. I've read that this is awesome for cold starts and would just like to make sure it can stand up to stop and go traffic in the 100 degree Florida summers. 0 answer
      Hello, How many quarts will my 2015 GT Premium take? Thanks! 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) One Quart bottle

      Tech Specs