Mixing AMsoil MTG with MTF

[daemontrym]

Is there any harm in mixing the 2?

After much research and thinking about my experience with Amsoil MTG in my 2012 Kia forte I think I may go with this mix. My car calls for 2qts of 75w85 Genuine Hyundai GL4. So I was wondering if I mixed 1 Qt of each if it would be ok. I read a couple posts about Pablo's Volvo experience with a 3:1 mixture which seemed great.

 

[tig1]

Use what the engineers spec for this trans.

 

[JZiggy]

I've mixed before with no problem. I would do it.

 

[JethroBodine]

Originally Posted By: daemontrym
Is there any harm in mixing the 2?



No, mix away.

 

[SOHCman]

Are you trying to stay in the 75w-85 range or want something different?

 

[daemontrym]

I would like to stay around the 75w85 GL4 that is speced for my Kia.

I tried straight MTG before and felt resistance in between shifts even warmed up.
When I went back to a 75w85(castrol Syntorq Mopar Part #4874459) it went away.

The problem with the syntorq is that I live in a desert climate and it shifts like [censored]
when its warm outside. I don't grind but the trans just feels real notchy from gear to gear.

I am hoping with the MTF/MTG that I would split the difference as the MTG was awesome besides the resistance I felt. It was almost like shifting against a wall in each gear even when warmed up.

 

[MolaKule]

And Redline MT-85 75W85 GL-4 Gear Oil is a 12.0 cSt MTL which should be close to what you will get when mixing MTL/MTG 50/50.

 

[SOHCman]

That might just be the nature of the trans? I have manuals from three different manufacturers, and they all shift wildly different.

Its interesting that the stock fluid shifts fine until its hot, perhaps because its dino? If thats the case, a proper weight syn from amsoil or redline should be the best to maintain smooth shifting as the temps rise.

 

[daemontrym]

SOHCMan I've already changed out the OEM fluid in my car and have tried a few others. I ran the stock fluid for around 6k and felt it was horrible. I currently have in the Castrol Syntorq 75w85 which I bought from a mopar dealership near my work. This is the same as the synthetic synchromesh my dealership recommended when I asked them about it.

I have run OEM, Syntorq, and Amsoil MTG, by far MTG has been the best fluid but feels like I shift against a wall from gear to gear.

What has me on the thinner kick is that there is a TSB for the Hyundai Genesis about a dealer campaign. The dealers are supposed to change out the 75w85 and put in Pentosin MTF2 which is 75w80. On Pentosin's website they even have a hyundai OEM part number on their as well.


So after doing some reading on that I believe that since the spec across the board for Kia and Hyundai Transmissions are the same, it maybe ok to go a little thinner for the same benefit.

The only reason why is because I commute in my car 83 miles everyday, so its something I have to deal with often.

 

[SOHCman]

I see, well especially with the existance of a TSB, i see no reason not to go thinner if it nets you the shift feel you desire.