Misubishi DiaQueen fluid for our trannys?

[Blue94VR4]

I always though the DiaQueen oil used for EVOs is fine to use for our tranny. However, I found one link on the net that suggests that it is GL5 LSD fluid which make it unsuitable for our GL-4 tranny. Does anyone know if Diaqueen is GL-4 or GL-5?
Thanks

[jay173]

Originally Posted by Blue94VR4

I always though the DiaQueen oil used for EVOs is fine to use for our tranny. However, I found one link on the net that suggests that it is GL5 LSD fluid which make it unsuitable for our GL-4 tranny. Does anyone know if Diaqueen is GL-4 or GL-5?
Thanks

Never heard of it I recommend a gl-4 and then adding a friction modifier for LSD. GL-5 isnt backwords compatible mostly used for differentials.

I use redline mt90 wich is gl-4 all you would need to add to that is there friction modifier additive.

One importent thing to do if make sure the gl-4 MT fluid you get is safe for brass syncros. I know the transmissions fluid can get pricy but it was well worth it when I used redlineoil that was recommended to me.

No stores around have it I baught it online, mostly find this stuff raceshops.

Having the right fluid makes world of diffrence then later having shifting problums and grinding gears, or replacing worn syncros.

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Let me offer to you a small excursus in area of transmission oils.
API classification subdivides all transmission oils into 6 classes:
API GL-1 - oils for light conditions. They will consist of base oils without additives. Sometimes they contain small amounts of antioxidizing additives, corrosion inhibitors, depresants and antifoam additives. API GL-1 oils design for spiral-bevel, worm gears and manual transmissions without synchronizers of trucks and farming machines.
API GL-2 - oils for moderate conditions. They contain antiwear additives. They design for worm gears of vehicles. The oils recommend to lubrication of transmissions of tractors and farming machines.
API GL-3 - oils for moderate conditions. The oils are containing up to 2.7 % antiwear additives. They design for lubricating bevel and other gears of trucks. Not recommended for hypoid gears.
API GL-4 - oils for operating in different conditions - from light to heavy. They contain 4.0 % of effective antiscuffing additives. The oils are designs for bevel and hypoid gears which have small displacement of axes, for gearboxes of trucks, for units of axles. These oils are recommended for not synchronized gearboxes of US trucks, tractors and buses, for main and other gears of all vehicles. Now these oils are the basic for the synchronized gearboxes, especial in Europe.
API GL-5 - oils for the most loaded gears, working in severe conditions. They contains up to 6.5 % effective antiscuffing additives. The general applications of oils this class - the hypoid gears having significant displacement of axes. They recommended as universal oils to all other units of mechanical transmission (except gearboxes). The oils which have special approval of vehicle manufacturers can to use for synchronized manual gearboxes only. API GL-5 oils can be used for limited slip differentials if they correspond to requirements of specification MIL-L-2105D or ZF TE-ML-05. In this case the designation of class will be another, for example API GL-5+ or API GL-5 LS
API GL-6 - These oils for the most loaded gears working in very heavy conditions (high speeds of sliding and significant shock loadings). They contain up to 10 % high performance antiscuffing additives. They designed for hypoid gears with significant displacement of axes. Now class API GL-6 is not applied any more as it is considered, that class API GL-5 well enough meets the most severe requirements.

As almost all Transmission Oils have S-P compounds (antiwear or antiscuffing additives) they affect on parts of transmission units from yellow metals. This affect is some problem at use the transmission oils in different applications. Often we can see the results of misusing these oils. For solution problem were advise the antiwear and antiscuffing additive from inorganic borate compounds which no affect on yellow metals. The overall level of these additives meet API GL-5 but as these additives not attack yellow metals the performances such oil are meet API GL-1. The use of inorganic borate compounds allows recommend such oils for all applications - from API GL-1 to API GL-5. It looks like Universal Transmission Oil.
Excuse me for long lecture, but I hope it will useful for you.

[Blue94VR4]

thanks. I use BG SS II myself. My original question was to satisfy my curiosity, since I've seen some people on this board who use DiaQueen for tranny.

[VR4Rob]

Bump for more answers on this. IIRC, Jack's Transmissions recommends Diaqueen fluid for our trannys.

[KORMEX]

Diaqueen is used on the evo Transfer case . Not for the transmission .Its supposed to have properties for the sliding (and pressure) of the ring and pinion in the transfer case , you don't need that in the trans . In fact it doesn't really help alot on the Evos either since there are so many worn and whinning ring and pinion gears .

[JackM]

Diaqueen is pretty awesome stuff, but you have to get the fluid for the tranny, NOT t-case. I don't know who would put the t-case stuff in a tranny...

Jack

[Blue94VR4]

Originally Posted by JackM

Diaqueen is pretty awesome stuff, but you have to get the fluid for the tranny, NOT t-case. I don't know who would put the t-case stuff in a tranny...

Jack

Are you saying that there is DQ for tranny?

[JackM]

Yes. There is a PN for Tranny, and PN for t-case.

[Blue94VR4]

Originally Posted by JackM

Yes. There is a PN for Tranny, and PN for t-case.

Jack,

Do you happen to know PN for the tranny fluid? Is it GL-4?
Thanks

[VR4Rob]

I have been running DiaQueen in my tranny for almost 1,000 miles now. It feels the exact same as it did before, perfect. It was around $100 for a gallon and I had to buy it from a local Mitsu. dealer. Rockville said they couldn't ship the stuff.

The trans fluid is of course GL-4. Per this page the part number is MZ313376 for the trans fluid.