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Getrag Fluid -Warning to synchromax users

38K views 97 replies 48 participants last post by  greygoose8732  
#1 ·
Many different theories of the correct Getrag fluid for our SVT. The comment that the trans is the same as the mini cooper is partially correct. The mini uses 2 different manuals and an auto. The cooper-S uses our SVT (285) trans. I believe there is much mis-information about using similar fluids to the mini cooper as the base cooper uses a 252 Getrag.
WD40 has linked a page from his SVT manual that indicates ATF fluid. My 2003 manual makes no mention of that, and I suspect it is not correct.

When comparing the fluid specs, it is apparent that the synchromax type fluids are not the correct spec for this trans. I listed in order below my choices based on similarities with the Ford spec fluid. For the boosted SVT's the second choice of Amsoil Severe Gear is probably pretty safe. For the NA vehicles, looking at saving friction to get the most FE and power leads to the Amsoil Synth Man trans lube. I keep picking the Amsoil based on their website info and the lack of competitors similar comparison data. You can decide for youself, but look at the specs first. The Kinematic viscosity at 40C and 100C show the thickness of the fluids at those temps, lower is better for friction reduction, but unsure of protection. The 4-ball wear is a standard test, with lower is better numbers, some motor oils have .32 ratings. The falex test involved load carrying capacity where higher is better and 2500 appears to be the top area.

The Ford perscribed WSD-M2C200-C (75W90 Gear oil) fluid has specs as follows (from the Ford pubilcation):
Kinematic Viscosity Visc
Fluid cSt 100 cSt 40 Idx 4-ball wear Falex
WSD-MC2 15.4 76 211 ? ?

Amsoil
Synt Man Tr 14.7 84.5 151 .45 ?

Amsoil
Severe gear 16.7 109.1 165 2500

Amsoil
Long Life Gr 16.6 129.7 137 2000

Royal Purp
Max Gear 19.1 132

-----------------------------------------------------------------------
Amsoil
Synchromesh 9.6 47.1 194 .40

Royal Purp
Synchromax 7.7 35.3 196


As you can see the synchroxxx fluids are substantially thinner than the Ford spec fluid. You may want to seriously reconsider using the synchroxxx fluids in this trans.
Does anyone have specs on other fluids that may be lower in viscosity and within spec for this trans? Always looking to reduce friction and increase HP.
 
#2 ·
How do you get spaces right in this space?

----------------Kinematic Viscosity---------Visc
Fluid -----------cSt 100-------cSt 40-------Idx-----------4-ball wear-------Falex
WSD-MC2--------15.4-----------76 ---------211--------------?-------------?

Amsoil
Synt Man Tr------14.7-----------84.5---------151-----------.45------------ ?

Amsoil
Severe gear------16.7-----------109.1--------165------------?----------- 2500

Amsoil
Long Life Gr------16.6------------129.7--------137------------?----------- 2000

Royal Purp
Max Gear---------19.1------------132-----------?-------------?-------------?

-----------------------------------------------------------------------
Amsoil
Synchromesh -----9.6 -------------47.1 --------194 ----------.40-----------?

Royal Purp
Synchromax -------7.7 ------------35.3 --------196------------?------------?


The Royal purple site also call for 10w40 for the SVT fluid, but I could not find the specs on that.
 
#6 ·
The Amsoil is half the price of the Ford WSD-M2C200-C, so I was figuring on save a few bucks and getting .001 HP ;).

At this point with the service grading, pretty much any oil (as long as it is the correct grade for your car) should be pretty reliable.

Tom,
In some of the tuner mags, they are constantly quoting ~5hp from wizz-bang synthetic over mineral based oil. Have you ever looked at any HP gain on the dyno using one oil vs another?
 
#17 ·
One has to be careful with equating higher viscosity numbers with being better. Beyond a certain point higher viscosities simply cause more heat generation.

In something like a gearbox you need to achieve a certain minimum viscosity for the rolling element bearings. Typically SKF will suggest 10 Cst as a minimum. All the oils you list will easily achieve that since the operating temperature for the gearbox should be well below 100 deg C.

For the gears themselves, the additive package in the oil is more important since you typically have extremely high sliding pressures at the tooth contact points. Again I'd expect most "quality" oils to have a good additive package which is rated for EP contact.

Once you have satisfied those requirements, thinner is generally better from a fuel economy and heat generation standpoint.

If you look back in history, the motor oils used were generally much more viscous than the modern recommendations. Its not that the bearing technology improved that much, its just the manufacturers wanted better fuel economy and improved analysis techniques showed that you could safely run with thinner oils.
 
#18 ·
i hate reading these parts...I had my mind set on something, then i read this...and now i am all torn up inside (tranny fluid)
 
#22 ·
https://www.amsoil.com/storefront/mtg.aspx

That is it. Again I was just questioning the Synchroxxx type oils in the Getrag gived the base Ford specs.
Just something to investigate before overspending on fluid you don't need, or putting in the wrong fluid based on the Ford spec.

The other Getrag fluid threads are confusing and full of opinions. I didn't see anything that compared the fluid specs, and I just happened upon the Ford base specs, so I though I would try to post some 'good' info based on the fluids.
 
#24 ·
That looks pretty comparable:

----------------Kinematic Viscosity---------Visc
Fluid -----------cSt 100-------cSt 40-------Idx-----------4-ball wear-------Falex
WSD-MC2--------15.4-----------76 ---------211--------------?-------------?

Amsoil
Synt Man Tr------14.7-----------84.5---------151-----------.45------------ ?

Mobil1 LS---------15.2-----------106---------150------------?---------------?

Depending on price, this looks good.
Amsoil does mention a friction modifier for manual transmissions. Not sure if that is an issue...
 
#28 ·
are you talking by your knowledge or by something written in a manual, i went to 2 ford dealers and they told me they had been using mercon V for the svt, somewhere i read that mike from hillbish had in his ford bible the svt used mercon v, i already have the fluid siting in my room but i cant decide if i should use it or not
 
#30 ·
The mini cooper-s used our 285 Getrag. There was also a NA mini that used a 252 Getrag, and an AUTO mini. The fluid spec did not specify 285 or 252. There may be very different fluid requirements between each trans.

The Ford fluid spec is posted in the first (2nd posting with spacing to compare) posting in this thread.

You can see that it is closer to a 75w90 gear lube than it is to even a synchromax type fluid. ATF is thinner than synchromax fluid.
The bottom line is that for the 285 Getrag, the Ford spec calls for a synthetic fluid with similar properties. I will not put ATF fluid in my trans and don't think it would be wise for anyone to do that either.

I was just looking for better alternatives to the Ford recommended fluid properties, but as long as you get a modern synthetic with similar properties, you should be good.