Product Reviewed: Manual Synchromesh Transmission Fluid 5W-30 (MTF)
Current Rating: 4.9 out of 5 stars
Votes & Reviews: 51 vote(s) and 48 user reviews.
Reviewed by Kyle: 
Purchesd 8qrts to go in my NV5600 behind my 03 HO cummins (got 8 because I added two FAST oil coolers and wanted a one quart over fill) I can't say exactly how much the fluid helped because I installed a new southbend clutch at the same time but it was a NIGHT AND DAY difference i used to FIGHT reverse SO HARD trying every trick in the book but read some forums saying the 5w30 syncromesh was the cure and it was!!!! Reverse is still stiff but that's just how those NV5600 are but now it actually goes into gear and all the forward gears go in like warm butter, worth the money hands down
Reviewed by Steven:
I want my Jeep to last. After seeing several YouTube videos on Amsoil I decided it was the best I could buy. So far I have no complaints and I will continue to use Amsoil.
Reviewed by Kenneth:
Effortless shifts in my Honda after replacing the standard fluid with Amsoil
Reviewed by Kelly:
Use this product on my 2005 Jeep LJ 6 speed for 4 years now with no issues. I have trusted AMSOIL products for a while now in my Jeep nothing but the best for her.
Reviewed by Oscar:
Replace stock fluid from my car witch felt rough at 60k miles. I have done two more oil changes and the gear changes are smooth. My car has over 190k miles now
Reviewed by Noel:
Switched to 100% synthetic in my 2017 manual transmission at 5000 miles, and I could tell the difference shifting, definitely smoother.
Reviewed by Al:
This alone fixed my third gear grinds (common on 8th gen civic si's), shifts a lot more smoothly never hAd problems again!
Reviewed by Guilty-Crown-:
Great replacement product that falls under guidelines for hard to find factory fluids, improved shifting performance and smoothness, reduced temps in high heat and massively improved startup shifts in minus 20-30c weather
Reviewed by Jim:
Shifting seems much smoother
Reviewed by ........:
First time user for the synchomesh fluid no issue yet
Reviewed by Lenny:
Been Mechanic last 10 years and I tow commercially part time, pull 8-16k lb campers, over quarter million miles on my nv5600 and looks brand new inside..I run 9 qts Amsoil synchromesh 5w-30 with pto coolers. I hated how truck shifted with factory fluid/pennzoil, so switched to Amsoil, about 400 miles getting amsoil worked in all gears and bearings, all my gears smoothed out, no notchy shifting, no double click like shift feeling,no issues going from 6th to 5th,much easier to speed shift it. Put 80k miles on fluid rated for 150k miles and I wanted to change it just to see how it looked after towing 8-16k lb travel trailers, went to drain fluid, came out looking brand new like I poured it out of a sealed new bottle of amsoil. Was more then pleased and happy to put 9 qts back in.
Reviewed by Army dude:
Fantastic poor point, so very beneficial in super cold climates, great shifting in all seasons.
Reviewed by SiouxLude:
Used this in place of the recommended honda 5w30 MTF and have been very impressed.
Reviewed by BTM:
I have a 2008 Acura TL Type S with a 6 speed manual. It has a helical type limited slip diff built into the transaxle, which presents a challenge to transmission fluid. Other fluids tend to break down and cause bad synchro performance, but Amsoil synchro shift is up to the task!
Reviewed by amazed:
I have been in motorsports for over 40 years, have never seen this much improvement in a fluid change alone. Removed Dex. III and applied Amsoil synchromesh unbelievable difference in the way my new (less than 200 miles on 450 HP street car) Temec 6 speed magnum shifts.
Reviewed by Josh:
I own a 2011 Civic Si Sedan, which all came with a 6 speed manual gearbox + Limited Slip Differential transmission.
Amsoil is one of the only synthetic products out there (apart from Honda's MTF) to offer an oil that's safe for the soft metals within a Limited Slip transmission.
On top of that, it made shifting even smoother than before, a noticeable difference.
I am very happy with this product and will definitely be buying again
Reviewed by jmcamp:
Changed the fluid in my wife's 2008 Honda Fit. Manual transmission has only 50,000 miles, but it's been in there for 10+ years. Transmission shifts easier and is quieter. This is the best product to replace your manual transmission fluid with.
Reviewed by Sergey:
Made shifting my Civic hatchback transmission smooth and easy, no more notchiness. Definitely recommended for Honda owners
Reviewed by Scrubb:
Excellent
Reviewed by SHAWN:
My 1994 Mustang uses Mercon ATF in the T5 5 speed. I was not happy with how notchy the transmission felt while shifting gears, a common complaint on this trans. I changed out the ATF and started using the Manual Synchromesh fluid. I had immediate results with quieter operation and smoother shifts. This product conforms to the specification by Tremec and since Tremec took over the T5 from B Borg Warner, it was a no brainer.
Reviewed by Ghost:
Great product!
Reviewed by Kyle:
Used this in my '02 Jeep TJ and noticed a big difference in the manual transmission. Before it used to shift a little rough when I be leaving first thing in the morning, now it shifts smoothly right off the get go.
Reviewed by Richard:
had to replace seal gears looked like new
Reviewed by Jon:
I had been using a synchromesh friction modified for 35k on my 03 acura cl and switched to this. This is just as good however during a clutch job I switched back since I had more time on it.
Reviewed by Dan:
Ran this in my 06 Tacoma front diff. Put over 100,000 miles on the fluid changed it still clean looked like honey! Great product!
Reviewed by SAABGUY:
Great Product,Probably The Best.Wish AMSOIL Cut One A Break On Shipping!
Reviewed by Dub-Dizzle:
I bought this for a manual transmission based on reviews, and have been super stoked with the performance.
Reviewed by davidconnolly:
It is well worth finding this product, as AMSOIL quality is unmatched. Industry insiders recommended this product to me, and now I know why.
Reviewed by Nick:
I have always used synthetics in my vehicles. When I started having problems with my trans in my Jeep Wrangler. I looked at a lot of fluids and found that more people had the problem fix/solved by adding Amsoil.
Reviewed by Big Jim:
I use 2qts instead of a the 1.86 it calls for. I love how it doesn't break down in the hot summer heat
Reviewed by Scott:
Used this the first time in a 5 - speed manual transmission in my Acura CL and now going to put it in my 98 Honda Accord with a 5 speed manual trans
Reviewed by Mcorvtech:
I have 44k miles on my 2013 Jeep Wrangler, have changed the manual trans fluid every 15k or so and was not happy with how notchy and would ocationally grind. After installing this fluid. Smooth sailing.
Reviewed by dauby:
upgraded to a better product
Reviewed by taz:
everything that I have used is fantastic.
Reviewed by Yourmomsbox:
I use it in everything I own
Reviewed by Billy:
I bought my RSX with about 83,000 miles on it. It had no maintenance records for when the transmission fluid had been previously changed. I changed it with Honda MTF about 3,000 miles later after it had developed a sticky third gear( basically it would catch when trying to put it into third gear). This seemed to work for a bit but it started to catch and stick after a while. I had been using Amsoil Motor Oil for my previous and current car and I had no complaints so I figured with no maintenance schedule for when previous fluids had been changed, it would be a good idea to replace all the fluids with Amsoil fluids, (which I did, except for the Power Steering Fluid which Honda/Acura are very specific about using their own brand... or else). Anyways, after replacing all fluids, the biggest noticeable difference was my clutch fluid(replaced with Amsoil Dot3 Brake Fluid) which came out a nasty brown color and looked like it had been there for the life of the car, that brought the spring back into the clutch, and my transmission. I had a hard time believing that changing the fluid would make that much of a difference. It felt like little robots had gone into the transmission and lubed up the necessary gears because third gear became buttery smooth. And I was scared that this was something that would last for only a little while, a placebo effect even, but I've put on approximately another 3,000 miles and the third gear grind has become a distant memory. Now this might not be your exact experience but Amsoil has changed my car, it has given me a reason to shift. So yeah, you should try it.
Reviewed by Ramrod:
Bearing noise seems to be gone with this oil. Will not know for sure tell summer heat and heavy load, but I'm a believer now.
Reviewed by Ed:
It's a great product, I have used several of Amsoil products and find them to be superior in every way. From my truck to my race car.
Reviewed by Touge Finder:
I replaced the OEM fluid in my Honda Civic Si for Amsoil Syncromesh as a precautionary measure.
If you own one of these you might know how the transmission is sensitive, this fluid totally smooths out shifts and keeps the action slick even in cold weather. Totally worth it.
Reviewed by peter:
I am slightly disappointed with the performance of my transmission in my 2012 Acura TL with manual transmission since I switched from the factory product to Amsoil. I have noticed a very slight hesitation in the second gear syncromesh, especially when cold. I am thinking that perhaps this fluid is not fully compatible with the factory stuff, and there is probably a little residual fluid from the manufacturer in the gearbox. Or maybe this stuff is so slick that the synchros can't get a bite. I am a maintenance fanatic, so I change the fluid every 15k, so perhaps the next service will render a better result.
Reviewed by Rabbit:
Installed at 30,000 miles changed it at 150,000 miles. My vehicle is a 2004 Dodge ram 2500 H/O Cummins , standard tranny. Pull a trailer approx 21,000 lbs about 20 percent of the time. No discoloration, no metal and no seal leaks. I am sold on Amsoil. Great products and great service. All of my truck's fluids are 100 percent Amsoil. Have not had any fluid related problems.
Reviewed by David:
This is one of the few synthetic oils recommended for the ZF 6-speed manual transmission in my 1995 Corvette. Lasts much longer and protects better than conventional fluids so the added cost is definitely worth it in the long run.
Reviewed by Michael:
I used this fluid in my 2014 Mustang GT (MT-82 Transmission). I was looking for a fluid that would perform better in cold temperatures than the OE Ford "DCT" fluid. Works great! Shifts are chunky and smooth instead of feeling harsh and overly snappy. In extreme cold (0 Fahrenheit) the MT-82 synchros can be grindy, but I haven't had as much bad synchronization since changing.
Reviewed by Keith:
Worked excellent in my 5 speed
Reviewed by Gregory:
Came highly recommended, only trans fluid i've ever used in my hard work Dodge NV5600.
Reviewed by Blazer:
Works great
Reviewed by Jason T.:
The product I ordered was exactly as I ordered, once I added the fluid into my car I could notice a difference immediately with a lot smoother shifting. I have also noticed grinding has stopped when going through the gears at high RPM'S (2nd gear grinding was the main reason for me switching the fluid). Product also arrived very quick to my house. Overall great product!
Canada
United States
Pairs well with roasted duck.
Very smooth. Notes of toasted chestnut and cinnamon. A light yet oakey finish.