Transmission Fluid Change - Amsoil Synchromesh Fluid

zeroptzero

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My car is less than 2 months old, with about 2k kms on it, and I have found the tranny to bit crunchy in 2nd gear when cold. It has never grinded, it just feels less than perfect when changing into 2nd gear in cold temp use. This is mostly during low rpm shifts I have seen this with other Hondas, and I was able to improve it before by running Amsoil Sychromesh.

I decided to swap out the factory fluid today for Amsoil Sychromesh 5w-30 vis. tranny fluid. It was super easy to do, I dumped the factory fluid and put in 2 bottles (quarts) of Amsoil tranny fluid. I didn't remove the air box, I just pulled off the air box lid and I used an extension to reach the fill bolt out. This saved some time compared to other methods I've seen on videos. An extended funnel worked great. The worst part is removing the lower engine shield, I hate that thing. My battery powered Milwaukee impact gun made short work removing the fill and drain bolts, zipped them off with ease. I got the car lifted with low profile car ramps for access, which were so easy to get the car lifted (8 inches) . No need to use the 2-jack method and no jack stands needed, though I have lots of jackstands and jacks that I could use. Fill and drain bolts torqued to spec on reinstallation.

Initial results seem to indicate this fluid works well, even in frigid cold temps it feels good right off the bat. It can take a few days of driving to get the fluid totally homogenous as some old fluid remains in the tranny, so it has to mix with the new fluid. It also takes a bit of time to get the new fluid to plate up on the tranny parts.

So far the tranny feels better cold and hot. The Amsoil is a thicker fluid but it works well when cold with it being a full synthetic, the Honda MTF2 may not be full synthetic even though it is a thinner fluid. I think the LSD will work better with this fluid too, diffs always wear less with thicker fluids. My first test drive with the Amsoil fluid was in -10 degree C weather, which is pretty cold. The factory fluid that came out had quite a bit of glitter to it from metal wear. I was surprised by the amount of glitter with so low mileage, but it was likely from break-in which tends to exhibit heavier wear at first.

On two days of driving I like it better than the stock fluid. It feels good cold and hot.
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OGGsr

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Excellent! I have some sitting on a shelf in my garage waiting to be put in. Waiting until This weekend when the weather will be in the 60's here in central Va. I used to use Motul MTF in my Integra many years ago and had good results but looking forward to using the Amzoil.
 
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zeroptzero

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Excellent! I have some sitting on a shelf in my garage waiting to be put in. Waiting until This weekend when the weather will be in the 60's here in central Va. I used to use Motul MTF in my Integra many years ago and had good results but looking forward to using the Amzoil.
Ah very cool, I think you will notice a difference, well worth the switch and that is cool that you have some on the shelf. Look forward to hearing how you like it.
 

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Ah very cool, I think you will notice a difference, well worth the switch and that is cool that you have some on the shelf. Look forward to hearing how you like it.
Did you need to replace a washer on the drain plug? I remember the other Honda manuals had them. Thanks!
 
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zeroptzero

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Did you need to replace a washer on the drain plug? I remember the other Honda manuals had them. Thanks!
I flipped the washer and re-used it. I can get two fluid changes from them on the drain plug without concern. I make sure to torque both bolts to spec. I should pick up some spare washers for the future but I am good for a bit.
 
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shreknips

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Hey thanks for sharing this. I have a '22 Si and it's my first manual car. I noticed the same thing going into 2nd gear and wasn't sure if it was normal. I'm also in Ontario so I've only driven it in these freezing temps lol. I guess I'll try that out at some point!
 
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zeroptzero

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Hey thanks for sharing this. I have a '22 Si and it's my first manual car. I noticed the same thing going into 2nd gear and wasn't sure if it was normal. I'm also in Ontario so I've only driven it in these freezing temps lol. I guess I'll try that out at some point!
Yeah definitely cold weather first start up stiffness can be considered normal for many cars and including Hondas. See how you like it for the rest of the season, it is good to know there are optional fluids if one wants to test them out in the future. Enjoy the ride.
 

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I changed my MTF with Amzoil yesterday and I can attest it does indeed shift a little better in colder temps and when the engine is cold. To get to the fill plug easier, I removed the airbox. Highly recommend this if you feel your shifter is a little notchy in cold weather.
 
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I changed my MTF with Amzoil yesterday and I can attest it does indeed shift a little better in colder temps and when the engine is cold. To get to the fill plug easier, I removed the airbox. Highly recommend this if you feel your shifter is a little notchy in cold weather.
Nice to hear more testimonials. Over the next 1-2 weeks you may find it working even better. I'm loving the new fluid, I have not had a bad shift since putting this fluid in.
 


OGGsr

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Nice to hear more testimonials. Over the next 1-2 weeks you may find it working even better. I'm loving the new fluid, I have not had a bad shift since putting this fluid in.
I put about 100 miles on the car the last two days and it's an order of magnitude better than stock. I don't know why Honda continues to put so-so transmission fluid in their cars.
 
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zeroptzero

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I put about 100 miles on the car the last two days and it's an order of magnitude better than stock. I don't know why Honda continues to put so-so transmission fluid in their cars.
Yeah I never understood why MTF2 Honda fluid is so thin, yet it doesn't work that well in cold temps. The Amsoil is a good bit thicker fluid yet it works better, and I've experienced this over several Hondas I've owned, same thing. Glad to hear it is working well for you.
 

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Coming from 10gen platform, we found that GM synchromesh trans fluid is better than Amsoil, it removed our 2nd gear grinding.
I tried both on my fk8 and sport hatch, GM fluid does feel much smoother
 

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I would be a bit concerned with this for the Amsoil considering the Si/Type R have LSDs:

"Not for use in engines, wet-clutch applications, hypoid rear axles or limited-slip applications."

Please correct me if I am wrong
 
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zeroptzero

zeroptzero

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I would be a bit concerned with this for the Amsoil considering the Si/Type R have LSDs:

"Not for use in engines, wet-clutch applications, hypoid rear axles or limited-slip applications."

Please correct me if I am wrong
Well yeah don't use it in engines, not good for wet-clutches due to friction issues, and it is too thin for rear axles that need gear oil. It is fine for torsen helical limited slips that are gear based, maybe not as good for clutch style LSD's.
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