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Royal Purple Synchromax Manual Transmission Fluid

Item 45004
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Market Price $21.99 You Save 25% ($5.54)
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    Features, Video & Details

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

    Review & Installation Video

    Review & Install Video

    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 Details

    MPN# 1512

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • (1) One Quart bottle
    Installation Info
    Tech Specs
    Will it fit my Mustang?
    • Boss 302 - 12, 13
    • Bullitt - 01, 08, 09, 19, 20
    • Cobra - 93, 94, 95, 96, 97, 98, 99, 01, 03, 04
    • Cobra R - 93, 95, 00
    • EcoBoost - 15, 16, 17, 18, 19, 20
    • GT - 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20
    • GT500 - 07, 08, 09, 10, 11, 12, 13, 14
    • LX - 87, 88, 89, 90, 91, 92, 93
    • Mach 1 - 03, 04
    • Other - 79, 80, 81, 82, 83, 84, 85, 86
    • V6 - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14, 15, 16, 17

    Fits manual transmissions

        Questions & Answers (49)

        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 (9) 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
        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
        How many bottles do I need for my 04 mustang gt manual transmission? With 1,4826. Miles 1 answer

          Customer Reviews (100+) Write a Review

          Overall Rating 4.8

          out of 5 stars

          • 2/5

            December 03, 2019

            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


            Year: 2016 Submodel: GT

            Helpful (0)

          • 5/5

            November 25, 2019

            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.


            Year: 2019 Submodel: GT

            Helpful (0)

          • 5/5

            November 24, 2019

            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


            Year: 2013 Submodel: GT

            Helpful (0)

          • 5/5

            September 22, 2019


            Year: 2013 Submodel: GT

            Helpful (0)

          • 5/5

            August 21, 2019

            Great as always

            Smoother shifts with no complaints! Definitely makes a difference over stock fluid in my opinion.


            Year: 2015 Submodel: GT

            Helpful (0)

          • 4/5

            August 01, 2019

            Great buy!

            Put royal purple in my transmission made a huge difference in noise level and shifts alittle smoother


            Year: 1999 Submodel: GT

            Helpful (1)

          • 5/5

            June 27, 2019

            Royal purple synchromax

            Replaced the clutch and pressure plate so while the transmission was out did a fluid change. The new royal purple I can actually notice the difference with less heat from the transmission and the shifts feel smoother will highly recommend this product.


            Year: 1989 Submodel: LX

            Helpful (0)

          • 5/5

            June 15, 2019

            Royal purple synchromax

            My 05 GT has 98,000. Drained tranny got royal purple. great piece of mind knowing it's in there every time I drive. Quite tranny as well.


            Year: 2005 Submodel: GT

            Helpful (0)

          • 5/5

            June 06, 2019

            Transmission Fluid

            Was having a problem with hard shifting. Royal Purple Synchromax is great at fixing the hard shifting.


            Year: 2013 Submodel: GT

            Helpful (0)

          • 5/5

            June 03, 2019

            Big Improvement

            Changed my factory fluid and replaced with Royal Purple. I noticed a significant improvement in shifts. As good as everyone says it is!


            Year: 2011 Submodel: GT

            Helpful (0)

          • 5/5

            May 03, 2019

            Great choice for mustang

            I always use the Ford Lubricant except when it comes the transmission and differential. Then Royal purple always seems to work better.


            Year: 2013 Submodel: GT500

            Helpful (0)

          • 4/5

            May 03, 2019

            Noticeable but not Earth-shattering change

            My '14 GT still had the Ford factory-fill in the MT82 transmission. At 54k, I determined that I wanted to change it out as the shifts seemed to be getting notchy, especially when cold. I strongly advise a fluid transfer pump for this job, as the fill port on the MT82 is inconveniently located in the transmission tunnel. With the pump, you can transfer all 2.7 qts into the transmission without crawling under the car (except to put the fill tube in the hole). Some fluid will spill out the hole, so have a catch tub under the transmission. The entire fill process took less than 10 minutes this way. Shifts immediately felt better, but still not 'great'. I think that maybe it will break in a bit with the new fluid and get better as time goes on. However, it is no miracle fluid, don't expect that it will repair ruined synchros or make that chipped up 3rd gear work smoothly again. I have never used any 'better than stock' fluid that lived up to it's high claims, and this RP fluid is no different. It's better than the Ford lube, but not amazing.


            Year: 2014 Submodel: GT

            Helpful (0)

          • 5/5

            April 26, 2019

            Manual transmission change

            I had changed the transmission fluid in my 2012 pony car a few months ago by my local Ford dealership. I had noticed before that every time I first started up the car that on the first shift into first gear the car was always jerky, which was very annoying to say the least. After I had the dealership change the fluid it stopped doing that. I still wasn't satisfied though and since I had recently used Royal Purple in my differential fluid change I decided to go ahead and change the tranny fluid to Royal Purple as well. I don't know if it's a placebo effect or not but I kind of sense the car seems to shift a little better. If nothing else it does give me peace of mind knowing that I have a better protecting fluid in both my differential and transmission.


            Year: 2012 Submodel: GT

            Helpful (0)

          • 5/5

            April 17, 2019

            blue 2012 gt

            It is time to change ( 50000 ) because of the mileage and I had used it in a 1989 5.0 I had and it made the shifting smooth, so I am going to use it in my 2012 GT. AM has good products so going to put it in and will update after a few miles has been run.


            Year: 2012 Submodel: GT

            Helpful (0)

          • 5/5

            April 03, 2019

            good stuff

            Used it for a 60K service on my '11 GT, worked really well. Shifting is smoother into first and down into second.


            Year: 2011 Submodel: GT

            Helpful (0)

          • 4/5

            April 01, 2019

            RP trans oil

            Have used the RP Synchromax fluid on both my mustangs T45 and T56 trans. I honestly did not notice any difference in shift feel with my T45. It has always been very smooth even with 96xxx miles on it. The T56 on my Cobra with RXT twin disc has always been notchy it has 36xxx miles on it, and the RP did not correct the notchy feeling, i was hoping to get rid off. The fluid seems to work as advertised but its no miracle liquid.


            Year: 2004 Submodel: Cobra

            Helpful (1)

          • 5/5

            March 13, 2019


            Purchased the Royal Purple Synchromax fluid for my 2015 Mustang. I was VERY tired of the clunky nature of my MT82, and have been looking at different shift kits to try and smooth it out. Ran across the reviews on this fluid, and even though I was VERY skeptical, I thought, for $50 it's worth a try. Holy cow, I cannot even believe the difference it makes! It's like someone poured all new liquid guts into my MT82! Totally smooth and different feel! Thanks American Muscle and Royal Purple! So even if you just changed out your fluid, HURRY UP and get your Royal Purple Synchromax from American Muscle today! On a side note, I found lot's of conflicting information as to if I needed to use Ford's transmission friction modifier with this fluid, even 2 Ford dealers didn't know. I ended up contacting Royal Purple's technical department, and the answer from them is NO, Ford's friction modifier is NOT needed for the 2015, S550!


            Year: 2015 Submodel: EcoBoost

            Helpful (0)

          • 4/5

            February 14, 2019

            Royal Purple my GT

            I use this in my Roush 2007 and it has made a big difference in shift s and rides smoothly.


            Year: 2007 Submodel: GT

            Helpful (1)

          • 5/5

            February 10, 2019

            So far so good

            Not too much difference. More of a peace of mind knowing my ride has royal purple in it.


            Year: 2014 Submodel: V6

            Helpful (2)

          • 5/5

            January 12, 2019

            Great for the price

            It makes the transmission shifts great ,I would highly recommend this product


            Year: 2012 Submodel: GT

            Helpful (3)