So i have been looking at the properties of what i'm currently running in my civic. It looks like it is a around 2cSt more visocous compared to Honda MTF and 5w20 alternative that they recommend in the manual.
I've emailed Amsoil asking what they think about it and here are their replies:
The AMSOIL MTF is going to be the best lubricant to use in this manual transmission. The use of engine oil would only be a temporary recommendation, and may be harmful if used for the long-term.
Both AMSOIL MTF and Honda MTF are (5W)30 viscosity. The specifications for SAE 30 say the viscosity must fall within the range of 6.9 and 12.3 cSt at 100 deg. C. . This shows us that both oils fall into the same acceptable range.
These are two different folks replying to my question.
Obviously they ate wrong on Honda recommendation of 30 weight. That said, i kind of wonder, how are they recommending this fluid for this particular application if they don't even know what is Honda's spec? Thoughts?
Amsoil MTF for Honda
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This shows us that both oils fall into the same acceptable range.
I ran Amsoil MTF in my 2003 Civic for about 100,000 miles with no issues. It did improve the shifting when the trans was cold.
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Originally Posted by parshisa
I've emailed Amsoil asking what they think about it and here are their replies:
Both AMSOIL MTF and Honda MTF are (5W)30 viscosity. The specifications for SAE 30 say the viscosity must fall within the range of 6.9 and 12.3 cSt at 100 deg. C. . This shows us that both oils fall into the same acceptable range.
Originally Posted by FowVay
Originally Posted by parshisa
I've emailed Amsoil asking what they think about it and here are their replies:
Both AMSOIL MTF and Honda MTF are (5W)30 viscosity. The specifications for SAE 30 say the viscosity must fall within the range of 6.9 and 12.3 cSt at 100 deg. C. . This shows us that both oils fall into the same acceptable range.
Here's my original request:
Good morning. I have a question with regards to Amsoil MTF that I've installed around 7,000mi ago in my 2017 Civic HB 6MT. Data bulletin states that this fluid is a direct replacement for Honda MTF, although it's viscosity is significantly higher compered to Honda MTF - 9.7cSt vs 7.5cSt. That being said, does this significant difference in viscosity makes it unsuitable for my application? are there any downsides to having more viscous fluid in the gearbox? Can this cause lack of lubrication in the input shaft bearing? For the reference, I live in TX so car is never exposed to below freezing temperatures. Thanks for your help
And here's the second one:
Thank you for the feedback. Below is the screencap from my Honda Civic's owners manual, and it states that as a temporary replacement to Honda MTF 0/5w20 motor oil can be used, and not SAE30.
That said, do you see the difference in the viscosity being a problem for this particular application? Should I continue using Amsoil MTF or switch back to OEM recommended fluid?
I'm responding to your question: "How come Amsoil doesn't know that?"
I going to guess the reason Amsoil's representatives don't know now what Honda has written in the 2017 owner's manual -- and, frankly, that's asking a lot -- is because for years (decades, actually) Honda owner's manuals said almost the same thing, except that rather than indicating that SAE 0W-20 or 5W-20 viscosity motor oil could be used as a temporary substitute for Honda MTF, Honda indicated that 5W-30 weight motor oil could be used. In fact, long before Honda started branding its own MTF, 5W-30 weight motor oil was the recommended fill.
However, the takeaway from Amsoil's response that's noteworthy is the fact that their product -- i.e., Amsoil Synthetic Manual Synchromesh Transmission Fluid -- has a CSt comparable to 5W-30 weight motor oil. (Actually, I think Amsoil's MTF has a CSt of approximately 9.5.) That viscosity, among other properties of Amsoil's MTF, is why (IMHO) it works as well as it does. And it does work well. Really well.
Just to be clear folks, I'm not bashing on Amsoil by any means, I'm using two of their products in my civic and am pretty happy thus far. Although, I'm trying to figure out (perhaps I should've done it prior to installing the fluid) if the MTF is a good fit for my application. Hope this makes sense.
I'd use T5 10w30 or some other HDEO 10w30 in a Honda transmission
Originally Posted by Hounds
I'm responding to your question: "How come Amsoil doesn't know that?"
I going to guess the reason Amsoil's representatives don't know now what Honda has written in the 2017 owner's manual -- and, frankly, that's asking a lot -- is because for years (decades, actually) Honda owner's manuals said almost the same thing, except that rather than indicating that SAE 0W-20 or 5W-20 viscosity motor oil could be used as a temporary substitute for Honda MTF, Honda indicated that 5W-30 weight motor oil could be used. In fact, long before Honda started branding its own MTF, 5W-30 weight motor oil was the recommended fill.
However, the takeaway from Amsoil's response that's noteworthy is the fact that their product -- i.e., Amsoil Synthetic Manual Synchromesh Transmission Fluid -- has a CSt comparable to 5W-30 weight motor oil. (Actually, I think Amsoil's MTF has a CSt of approximately 9.5.) That viscosity, among other properties of Amsoil's MTF, is why (IMHO) it works as well as it does. And it does work well. Really well.
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