Best Gear oil for NEW tranny?

[RipperXX]

Well on 2nd thought, the paper the tranny came with DID say, Mobile 1 syn, Redline MTL, or OEM mitsu gear oil.

Note: MTL not MT90.... hmm I think I will leave the MTL in unless I notice in the summer it seems to thin or has issues in hot weather or something. As winter isn't to far away and the thicker MT90 most likely wouldn't shift as well in 35-55*F weather.

I'm running Amsoil.

How's that working for you? I know Amsoil makes some damn good stuff.

 

[marq95gst]

BG Synchroshift II as recommended by Jon at TRE for my TRE tranny.

 

[Splitpi]

I am having no real problems. My only complaint is that when the temp was 10 to 15 BELOW zero it was stiff shifting.

 

[RipperXX]

BG Synchroshift II as recommended by Jon at TRE for my TRE tranny.

I could be wrong but I think TRE sets their pre-loads/tolerances etc. differently.

 

[90gst_sean]

I believe you said you have a Jack's transmission, right?

They recommend Mobil 1 because that's what they've set up all the bearing preloads for, and they also spun it up with Mobil 1 in it for testing purposes. Why would you run anything else?

Jacks Transmission now requires: 50/50 mix of Redline Shockproof & Valvoline 80w-90; to maintain warranty.

--Jacks Transmission Warranty Agreement statement as of 09/05/08--
"If you are unable to locate Mitsubishi MR 6-speed oil from the Mitsubishi dealer, Redline Heavyweight Shockproof 50/50 mixed with Valvoline 80w-90 gear oil will also work just as well. This is very important; use of other fluids will void your warranty."

 

[Freerevving]

NEVER put Mobil1 in your transmission, unless it's RWD... I've seen it cause grinding after 1000 miles in several transmssions (2 of them were mine), and it has nothing to do with the bearings, it's all about the synchros.

and shock-proof has paraffin wax in it.

MTL will not hurt your tranny in any way... it's just a little thinner than MT-90... Pennzoil Synchromesh is A LOT thinner and it works just fine (although I'm unsure of how much high-load shock protection it provides)

All redline gear oils are pure synthetic ester-based, and contain no corrosive additives (sorry no phosphorus). None of their gear oils will corrode your synchros... BUT gl-5 is too slippery and prevents proper synchronizer engagement in a FWD/AWD transmission... the "slipping" of the synchros is unnoticeable for a while but after the synchros become worn enough, there will be additional slippage and then you experience grinding.

I highly recommend using pure synthetic GL4 (no matter what brand) in a new/rebuilt AWD transmssion... And I have never heard about any bad long-term effects from Pennzoil Synchromesh (aka GM Synchromesh) as many of my friends have used it with great success, same as my use of Redline....

Also, Amsoil GL4 comes highly recommended from many people I know and is what I'm using next

 

[RipperXX]

Jacks Transmission now requires: 50/50 mix of Redline Shockproof & Valvoline 80w-90; to maintain warranty.

--Jacks Transmission Warranty Agreement statement as of 09/05/08--
"If you are unable to locate Mitsubishi MR 6-speed oil from the Mitsubishi dealer, Redline Heavyweight Shockproof 50/50 mixed with Valvoline 80w-90 gear oil will also work just as well. This is very important; use of other fluids will void your warranty."

Thank you very much as I have not even seen my car in the past 9 months I was unaware of this. I only drove it maybe 1,200 miles or so on the Redline MTL before parking it again due to warped head and blown HG. So when I get back state side I will have to remember to change it to the Mitsu oil or the 50/50 (mitsu if I can get it) Cause even though the yr long warranty is up on my tranny I figure maybe if something happened he might work with me due to circumstance on my part (iraq sucks) and low milage of it or something you know *shrug* never hurts to be safe anyway.


My only question is, did he change the warranty agreement as well as tolerances? Or just decide to only warranty it with those two fluid(s) ?


Thanks guys there is some decent info in this thread.

 

[JackM]

Your MTL is okay. I will not void your warranty for using it. I need to keep the instructions simple or people might use the wrong stuff. If any of you have my tranny and want to use something other than what is in the instructions, just email or call and ask.

Fluids that WILL void your warranty in our trans are:

Pennzoil synchromesh.
Any of the BG synchroshift oils.

The wear I have seen from the oils above is just unbelievable! Terrible gear tooth, hub thrust, 3/4 fork and intermediate shaft end bearing wear. It's always easy to see which units use the Penz or BG fluids when I open them up.

Jack

 

[Vicious_mole]

Your MTL is okay. I will not void your warranty for using it. I need to keep the instructions simple or people might use the wrong stuff. If any of you have my tranny and want to use something other than what is in the instructions, just email or call and ask.

Fluids that WILL void your warranty in our trans are:

Pennzoil synchromesh.
Any of the BG synchroshift oils.

The wear I have seen from the oils above is just unbelievable! Terrible gear tooth, hub thrust, 3/4 fork and intermediate shaft end bearing wear. It's always easy to see which units use the Penz or BG fluids when I open them up.

Jack

just a ? for you sir Jack, what would you remmomend in a higher milage manaul trans? im doing a 5 speed swap in my auto car and am looking for the best fluid i can get

 

[JackM]

On an old trans with old organic lined synchros we have had the best luck with the Mits fluid. There is no part# for it, but Mitsubishi sells a generic fluid that works great in old trannies. If you ask them for trans fluid for a manual Eclipse V6 2001 trans they can sell you Mits brand fluid at around $7-8 per quart that is just awesome! We buy the stuff in 5gal jugs for around $120-130. It's really good stuff.

Jack

 

[Jon Lane]

last month i asked Jon at TRE what the best oil would be to run in my TRE stage two tranny, this is what he replyed:

"We really like the 6 speed gear oil thats used in the EVO MR transmission. It's the whip.
Jon Ripple"

I asked Jon about MTL90 in my new TRE box and he highly approved. After 600 miles, it's got a nice, smooth feel to it.

TRE warns against Shockproof.

 

[Freerevving]

I just don't know if I agree with changing out the transmission oil every 5000 miles.... if you use the synthetic oil they recommend, you shouldn't have to change it but every 100k miles or ten years.

Your MTL is okay. I will not void your warranty for using it. I need to keep the instructions simple or people might use the wrong stuff. If any of you have my tranny and want to use something other than what is in the instructions, just email or call and ask.

Fluids that WILL void your warranty in our trans are:

Pennzoil synchromesh.
Any of the BG synchroshift oils.

The wear I have seen from the oils above is just unbelievable! Terrible gear tooth, hub thrust, 3/4 fork and intermediate shaft end bearing wear. It's always easy to see which units use the Penz or BG fluids when I open them up.

Jack

I had a feeling that Synchromesh would have a downside... just seems way too thin. I've never had to use that brand because I've always had access to Redline or mineral based GL-4.... which are obviously much thicker

....you should probably add GL-5 oil to that list, as I've seen it eat up the synchros in several transmissions. In a couple, the damage was too much and couldn't be band-aided with GL-4... they had to be rebuilt.

 

[jmakado]

If you have access to both the MR fluid and the older mitsu fluid what would you reccommend Jack? This is going in an original 110k AWD tranny that will be coming to you next spring!
Thanks.

 

[JackM]

I would use the older stuff. Some of the newer oils have more detergents in them which can literally clean the rest of the lining off of the synchro rings causing some issues.

Jack

 

[link16]

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part # is MZ313376A it is the 6speed MR trans fluid. I will ask my boss tomorrow about the policy for me to sell these not over the counter. The cost will probably be around $110-120 shipped for 4 quarts.

The attached image is the exact picture of the can that it comes in, still on the shelves at a Mitsubishi dealership.

 

[havoc742]

More info on Amsoil would be great. It is what I was told to put in my 93 awd.

Not knowing the problems with Mobil 1 and the fact that I can only find Amsoil at once place locally I just put Mobile 1 in. Thanks to this thread that crap is coming right out. Damn oil only has 5 miles on it. Oh well, I'm not taking any chances.

 

[RipperXX]

Realized I never posted my conclusion in this thread. I swapped out the Redline gear oil for some of Jacks Mitsu gear oil for the Evo MR. Drained the Redline gear oil and refilled the trans with the Mitsu stuff which I recall smelled odd, had a chemical like smell and seemed thin for it's weight *shrug* but soon as I pulled out of the shop on post and made the first gear change my jaw dropped when I realized how smooth it shifted. I will never use anything else but the Mitsu gear oil now.

 

[Spoolin4Ever]

Realized I never posted my conclusion in this thread. I swapped out the Redline gear oil for some of Jacks Mitsu gear oil for the Evo MR. Drained the Redline gear oil and refilled the trans with the Mitsu stuff which I recall smelled odd, had a chemical like smell and seemed thin for it's weight *shrug* but soon as I pulled out of the shop on post and made the first gear change my jaw dropped when I realized how smooth it shifted. I will never use anything else but the Mitsu gear oil now.

Great; glad you like the mitsu fluid! I was suprised to see this post in my email since it's a 4 year old thread!

Was the Mitsu fluid it hard to get?

I can get Redline MT90 easily available and it's good for 100K miles in an AWD transmission, so I think I will stick to that.

And for you people thinking Redline MTL is ok to run, actually if you use the search feature people have had bearing go out and other problems in an AWD with Redline MTL fluid. Some people mix it 50/50 with the MT90, but why bother? I mean I like getting 100K-200K out of a rebuilt transmission myself. I get tired of swapping transmissions! Once is enough for me, thanks. Yeah this transmission had some thin watery fluid in it when I bought it, good thing I put in the redline MT90 in time to keep it going.

Why use anything that does not meet the specs? These pi__water fluids are gonna cost someone a transmission eventually. They did my first one actually, because I listened to some DSM Experts tell me to switch to BG synchroshift for "smoother shifting when cold", yeah great especially if you want to buy another transmission in 30K miles!

 

[RipperXX]

Thats why I decided to change the gear oil. Jacks rebuilt the trans and the Mitsu fluid is what he has always said was the best for these (best I recall). Sure seemed right to me! And I too don't like pulling the trans for any reason so reliability is very very very important to me.

As for why I updated a 4 year old thread, I just started going though my subscribed threads and getting rid of the ones that were "useless" to me now and updating ones I should have.

 

[2g4me]

Dude mentioned before that Synchromesh states its for FWD tranny's...I beg to differ. Since my first tranny (AWD) miserably FAILED (had the mitsu oil in it) I've used nothin but Synchromesh (only because it was recommended to me) in all my manual cars to include but not limited to all 14 of my AWD dsm's and my 800whp 350z and NEVER a problem with it. Even on cold starts on extremely cold days during the winter months, shifts smooth unlike others that cause stiff shifting till its warmed up. I've never tried Redline but ive heard its more or less the same, but it's nearly if not double the price, so i dont bother. Synchromesh is awesome and has never failed me.

 

[ceedawg]

Redline MT90 is what was recommended to me by a very credible 9 sec dsm/evo tranny builder. Thats the route Im going...Thanks Raif!

 

[97grnrs]

ive had good shifting and luck with royal purple 75/90 full synthetic, 21$ per quart but ok for me

 

[Colt4G63 also]

ive had good shifting and luck with royal purple 75/90 full synthetic, 21$ per quart but ok for me

That's a GL-5 oil, which is exactly what you DON'T want to put in your transmission.

 

[GPTourer]

I used to use Syncromesh but now I use Redline MT-90. I use OEM Mitsu fluid in my Evo.

I don't see how if Syncromesh is only for FWD that that means it rules out AWD Mitsus, which are basically FWDs themselves. I'm thinking they are specifically not wanting you to use it in RWD cars and trucks.

 

[donniekak]

I used to use Syncromesh but now I use Redline MT-90. I use OEM Mitsu fluid in my Evo.

I don't see how if Syncromesh is only for FWD that that means it rules out AWD Mitsus, which are basically FWDs themselves. I'm thinking they are specifically not wanting you to use it in RWD cars and trucks.

They specifically don't want it to be used in any non light duty vehicle.