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Old 11-13-2009, 09:50 PM   #1
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Default Best fluid for my 6 speed

Need to know what fluid would work best for my situation and style of driving.
Picked up a 6 speed for my freshly rebuilt motor. Everything is almost ready to go as far as driving it.

NOW, I need to know what would be the cheapest/decent fluid I could use in there?

The car is a street car 100%. I want a super smooth shift feel and to make sure the transmission stays in great shape. Nothing more nothing less. I don't need some super racer super duper magic fluid, just easily obtainable fair priced decent stuff.

From a bit of research I've noticed a few being used:
1) Redline MT90
2) Motul (don't know specs)

And I've been told about this new "Motorcraft" stuff that m.netters are raving about recently. The motorcraft stuff looks like its 23 bux a quart. Way too much. Redline seems to get reviews that its great when warmed up, but notchy/not that great when cold. Motul I've seen Hustler and Emilio post about using.

So what is the best for a street car that wants shifter smoothness as #1 priority?
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Old 11-13-2009, 10:19 PM   #2
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6 speeds aren't known for their smoothness.

Hustler has a thread on this. There's also a ton over at m.net.
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Old 11-13-2009, 10:22 PM   #3
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Read hustlers thread. From what I gather he ended up using the Motul. Didn't look too much about the subject on m.net, thanx for pointing that out. I'll go search there too.

But I also want your guys' opinions on what YOU ALL think would be best. Those of you with 6 speeds anyhow.

Again this is not a track car, so I don't want the crazy or expensive ****. Just good oil I can use in my street car.
And I know 6 speeds aren't known for their smoothness. I just want it as smooth as it can be.
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Old 11-13-2009, 10:42 PM   #4
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I'm seeing a few posts (there) with people saying that synthetic transmission oil usually tends to be smoother when warmed up and not that great when cold.

Should I stick with non-synthetic?
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Old 11-13-2009, 11:17 PM   #5
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Royal Purple
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Old 11-13-2009, 11:18 PM   #6
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Many MSM owners like the Motorcraft fluid. I used it on both my 6 speed and 5 speed with good success. It gets better after 500+ miles.
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Old 11-13-2009, 11:19 PM   #7
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Motorcraft MTX-75 IB5 transmission fluid XT-M5-QS

This is the best price I've found. It should take about 2 bottles.
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Old 11-13-2009, 11:38 PM   #8
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Quote:
Originally Posted by gaan View Post
Motorcraft MTX-75 IB5 transmission fluid XT-M5-QS

This is the best price I've found. It should take about 2 bottles.
That is a much better price than the 23 I've seen. Thanx for the link.
I'm going to try to find some locally first, but if all else fails I'll have to order from those guys.
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Royal Purple
REALLY? Intersting you should say that, cause I really loved royal purple on my subaru's, however don't seem to see ANYONE neither here nor at m.net say anything about this stuff.

BTW: I put in Royal Purple into my 5 speed a while ago, and after a week or two the transmission started leaking. Just out of the blue. So I am kinda scared to use Royal Purple in fear of it eating through my seals. Re-sealed the transmission, put in regular non-synthetic fluid, and it never leaked again.
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Old 11-13-2009, 11:46 PM   #9
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Motul 300 is the stuff that Gary at TDR recommends. It is also about $20 a quart. I think I will be trying the Motorcraft stuff for grins. Trans fluid does not get changed very often so the difference between $10 a quart and $20 a quart is not too bad IMO, especially if it improves shifting. There is a loooooooooooong thread at m.n about the Motorcraft stuff. Make sure you get the right one. There is a slightly cheaper version that is not the same thing.

edit: here is that thread
http://forum.miata.net/vb/showthread...ght=motorcraft
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Old 11-13-2009, 11:49 PM   #10
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Quote:
Originally Posted by 18psi View Post
REALLY? Intersting you should say that, cause I really loved royal purple on my subaru's, however don't seem to see ANYONE neither here nor at m.net say anything about this stuff.
My friend Tom put it in his MSM over the summer and was raving about how much better the trans shifted and stuff. He really liked it.
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Old 11-14-2009, 12:32 AM   #11
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Go with the Motorcraft stuff. When you are at the dealer and they tell you their price, ask them if they can do better. I've been getting it for less than $15 a quart.
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Old 11-14-2009, 01:17 AM   #12
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Never used Motul in the trans. Might be great but I wouldn't know. We do use Motul RBF600 brake fluid though.

Autocross/track cars
Had the best results so far with Amsoil FGR 75-90 with 2 oz. of GM 1052358
LSD additive.
Testing Amsoil MTG 75-90 Syncromesh now which has modifers for the syncros built in.

Street cars
We like to use something lighter to shorten time for things to warm up and start working smoothly on a daily driver, 70-80 MTL with no additives unless the trans is tired in which case we'll add 2 oz. of 1052358
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Old 11-14-2009, 03:41 AM   #13
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I use MT90 because its cheap and stocked locally. I don't have any complaints about it aside form the shift feel in the 6 speeds aren't as nice as the 5-speeds to me. When the time comes ill be switching to the Amsoil and tossing some of that lsd additive that Emilio uses.

I DD the MT90 for about a year, no complaints.
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Old 11-14-2009, 04:22 AM   #14
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I have amsoil 75-90 MTG and need to add the GM friction modifier because it still shifts like ****, but better than most 6-speeds. Replace it often if you track the car.

Just make sure you use a GL-4 and let us know what you find.
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Old 11-14-2009, 08:28 AM   #15
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Recommend the Ford stuff, though pretty much everything works ok.
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Old 11-14-2009, 10:46 AM   #16
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Quote:
Originally Posted by ArtieParty View Post
Royal Purple
beat me to it.
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Old 11-14-2009, 11:26 AM   #17
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Quote:
Originally Posted by ArtieParty View Post
Royal Purple
GL-5 = GL-Fail

I put some in the old 1.6 trans and 3rd had multiple levels of engagement. I then switched to penzoil synchromesh and after about a week it fixed itself.
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Old 11-14-2009, 03:32 PM   #18
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Thanx guys. Really appreciate all the feedback.
I think I'll go down to the local Ford dealer and see what kind of price I can get on the motorcraft stuff. Redline mt90 will probably be 2nd on the list since my local kragen stocks it too.
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Old 11-18-2009, 06:45 PM   #19
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Just picked up 2 quarts of the Motorcraft stuff from local Ford stealer.
Total was 38 bux.
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Old 11-18-2009, 06:49 PM   #20
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Let me know how you like it after a couple of weeks. I think I might use the same stuff in my trans.
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