10 replies to this topic

[Terry Haines]

Thought I'd throw this up again as so many owners still insist that ATF is correct for the MTX75..As you can see it is not, so ignore your old hand book specs,they are out of date and have been for many years!

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[Trykstyr]

Hi Terry,

I'm glad to see this answered as I had asked my auto parts store this very question. The guy there said ATF fluid too. I asked him if he was sure and he called someone to double check and thats what they said too. According to the chart, my CSVT will use XT-M5-QS Full Synthetic. What does that translate into at my local parts store? As I'm getting my tranny put in this MAY be relevant to me very soon.

[Trykstyr]

Would you recommend Amsoil? I have been looking at this >>>>> http://www.amsoil.co...x?code=MTGQT-EA

[Terry Haines]

I have noticed that Amsoil now list a 'new' manual trans fluid for the MTX75,I think this meets the Ford spec but I have yet to try it or get any feedback from owners who have.The Ford honey of Royal Purple 'Syncromax' have been the common choce for a while..

[Trykstyr]

Can I use any full synthetic 75W90 gear oil?

[Terry Haines]

Nope..as most are just for hypoid rear ends and are of GL5 or higher...not good for the MTX75

[Trykstyr]

Ok so I found a place about 100 miles away that has RB Synchromax. Im going to go get it tomorrow before I take my wife out for her birthday. They have 2 quarts left but I read the car takes 2.1 Quarts. is the .1 quart for friction modifier? If not do I really need to get a third quart just for that .1?

[Terry Haines]

....is the .1 quart for friction modifier...

NO..Do NOT use friction modifier at all now in any MTX75..that is also old hat spec that is now obsolete...

[spridget]

Royal Purple SynchroMax works great. I'll use it exclusively from now on.

FYI - earlier MTX-75 (rod shift) require slightly more fluid, about 2.5L, later units (cable shift) require less, about 2.25L. Purchase 3 bottles either way.

[MysticGold04]

What about a 2006 model capacity? 2 quarts was not spilling out of the fill hole.. should I "fill to spill" ??

BTW could not find the RP locally so I used Rotella T6 5w40 until I can get the RP stuff.

Edited by MysticGold04, 27 October 2011 - 12:10 AM.

[spridget]

Ive used rotella a couple times and it works ok but I was getting alot of noise at from the gearbox at idle. Sounded like a loose exhaust heat shield. Drained and switched to RP, noise is gone and cold shifting is much smoother. Rotella is good for short term use or flushing a box that had ATF.