viscosity shear in MTF's

[tdi-rick]

Does anyone have any hard data of how much an MTF can shear over an average OCI or part thereof ?
I'm particularly interested in the performance of the fluids from boutique suppliers.

 

[Pablo]

Another great question. I don't have a great answer. Seems like some of the MTF's shear fairly rapidly.

I would expect the POE based gear oils to barely shear, and maybe the lighter PAO gear oils shear less than 5% or so.

 

[Whitewolf]

It depends on what viscosity modifier has been used in the formulation and how much has been used depending on the base oils chosen.

 

[tdi-rick]

I know that, but even those formulations without any VII's (Redline, Amsoil, Neo, SF, et al) or very trick VII's (Castrol use similar chemistry to 0w30 GC in their MTF's such as Syntrans) will tend to shear, but how much is the question.........

 

[Whitewolf]

You are correct. There are parts of the add pack that will shear even if there is no VM. The trouble is that you cannot tell what is going to happen there without test data.

 

[Gurkha]

Wonder how much the Delo400 is shearing on my MB transmission?

 

[tdi-rick]

generally motor oils don't hold up very well in gearbox use.
Redline claim that an average 10w30 will shear from around an 11cSt fluid to approx 6cSt @100*C fluid in as little as 5000 miles.

I'd still love to see some numbers from actual use......

 

[mokmaoxo]

ive been using supreme 10w30 on my civic transmission for 6k miles , should i worry about it? should i change it ?

 

[Mr Nice]

Mokmaoxo,

What year is your Civic ?

 

[mokmaoxo]

92

 

[Mr Nice]

Any 30 weight dino oil will do just fine.

 

[unDummy]

I don't think that any 30wt oil will do fine. This is one reason why MTF's have arrived. The newest SM/GF4 oils are friction modified for MPG. They might not be the best choice for old and tired synchros.
If you want to use a motor oil, try to find a diesel or motorcycle oil. If you can't find an HDEO or bike oil, use one of the MTFs/MTLs, either OEM or boutique brand.