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1600 miles on the 10w30 HM and no problems(3.55 tranny in a Mitsu). Got an input shaft seal leak that will be fixed when I get the new disc in but other than that, no problems. Shifts smooth.

Yes when it's really cold out (around 20 or below) the first few shifts are a little "thunky", but I don't know if they would be any better with the $15 a quart NV-T350 stuff I used to use.

MB

yea bullett thats excatly how mine is here in february in pennsylvannia! after its running for awhile like 10-15 minutes its usually fine. i believe my input shaft seal leaks also but i have better stuff to work on at the moment and to pay people t o work on mine isnt too bad. i think ill just put atf+4 back in on like tuesday or thurs and call it a day

O
Hopefully it wont get all grindy and weird before this weekend (not driving it might help)

I'm sorry it didn't work out for you.

Mike

The problem with running Mobil 1 HM is it doesn't have any additives for the brake material on the blocker ring and will cause premature wear which will cause shift problems in the long run. Seeing as how the blocker ring does ALL the synchronization ( brake material pushes on cone part of clutch gear either speeds up or slows down the gear depending on if it's downshifting or upshifting) I wouldn't want to run a oil that will cause them to wear faster and slip.

I'm not saying that the M1HM won't work for a while, but I am saying it will cause your synchros to wear out considerably faster. The M1HM also doesn't have the friction modifier in it which the original Mopar T-350 oil does and so does the (Amsoil Synthetic Synchromesh MTX)oil does (which is also better for any LSD you may be running).

The head engineer for the T-350 personally worked with Amsoil in designing the Amsoil SSMTX with all of the requirements and then some for the T-350 and T-850. The Amsoil is better than the mopar MTX because it's full synthetic and doesn't sheer out like the Mopar oil. Essentially it stays better for longer and doesn't get gummy.

In all the shift tests done with the T-350 and the all the 3 different oils the Amsoil came out on top followed by the Mopar oil and last was the ATF+4. The Amsoil was leaps and bounds above the other 2 oils in every category especially shift effort, noise, oil temp., wear, over-all shift feel and oil life.

So you guys can take it for what it's worth but I know I'm using the Amsoil because that's what is recommended by the engineer who designed it and based on the results of the tests performed on the oils.

I have noticed considerable resistance in shifting since trying M1HM. Used to engage quite smoothly at all times; hot or cold. Might mileage is coming out tonight!

Never had that problem. shifts smooth and nice.

over 100k miles on this transmission.

It is in all three of my running Neon's

Mike

Hmmm, this is why we are using the SL and not the SM. We can argue all day long. End the end it is going to come down to personal opinion. I owe you a phone call anyway. We can have fun discussing it then.

I'm in a very hot climate... I never have had a problem.

Mike

yea mike the fluid im running shifts as good as it did with the factory fluid when warmd up to temperature, its when its around 20 degrees the HM doesnt flow good cold as the others and it shifts a little clunky for the first few shifts untill its warmd up. if i was to live in texas or arizona there would prolly be no problems at all with the HM

I can see your issue. I think the 5w40 would do you better. it is understandable.

I feel bad you are having the issue. It is not because the fluid is not working persay.

Mike

yea i know cause the other day it was 40 and it workd fine

Give me a call and we can talk about it in depth. I also want to talk to you a few other things I found out.

Terry

Reword that post. I'll call you later.

Suppose it gets colder up here, at least it has been these past few weeks. Different climates sometimes require slight variations in maintenance.

Absolutely, but I still stand firm on the use of Mobil 1. There are options for colder climates.

Mike

ok so this morning i put the factory liquid gold in my tranny after it took 10minutes for the HM to drain out(it was 15 degrees this morning so yea it was thick!)

after driving it again id say it drives and shifts better then its did in awhile maybe evan shifting better then the amsoil!.

The engineer also told me that the synthetic motor oil could eat some of the seals up especially the input seal. The input seal is the cheapest seal in the whole unit and is prone to premature faiure anyway without something helping it out.

I want to know what additive is in the Mobil 1 HM that allows the clutch material on the blocker rings to operate correctly and wear properly?

The SL means that there is only 1 additive that hasn't been taken out as much. I forgot the %'s but Ed told before. By my count that still leaves a whole mess of other additives that aren't in M1HM motor oil keyword being motor that are in the Amsoil SMTX. The Amsoil SMTX doesn't have to meet emission standards because it's specifically designed for this application, hence ther additives you can't use in a motor oil.

The Amsoil is 5w-30 so it won;t have the cold issues like the Mobil1 HM.

I just want to know what you know that the guy who engineered this tranny doesn't know about the M1HM . I can't accept what you say just because you said so and also have never used the Amsoil SMTX fluid.

I can't say which fluid is better because I've never run the M1HM and just started using Amsoil myself but I saw the test results with my own eyes and tend to side with the guy who engineered the unit and knows all of the IDEAL requirements the fluid should have to give the tranny the best over-all performance.

I'm curious if you run M1HM in your race car only or if you run it in all of your neons and if you run it in all of your neons what's the most miles you've put on it using the M1HM oil?

What about Mobil 1 75w-90 gear fluid. Saw a few other brands as well, right around the same price.

So Terry, it might have been my imagination since I can't find it now, but I thought there was a reason stated in this thread to choose the Mopar lube over the Amsoil, but now I can't find it. . . .

I do see one reason to choose the Mopar lube over the Amsoil lube stated right in your post, and that is that the synthetic lube will eat up the input shaft seal. Now in that circumstance you did again use the keyword MOTOR. Is that pertinent to the difference? While I don't imagine this problem with synthetic hurting the seals is something that happens quickly in the least, it IS a reason to choose the Mopar lube.

So, on the other side of the equation, what specifically was it that the Amsoil did better than the NVT350 lube, if there is anything besides the slightly longer operating life? I've always liked Amsoil products, so I'm interested to know.

Thanks for your contributions!

Thad

so after running the liquid gold for a couple days the butt dyno likes it better also

No, I'm not changing yet, but just curious. The liquid gold being the old mopar nv-t stuff @ $15 per quart or the ATF+4? The only motivation for me to change was the fact that the stealership would only sell me the ATF+4 crap.

MB

There are detergents in motor oil that aren't found in MTX fluid. The materials of the seals were obviously one of the considerations when the engineer helped to develop the oil. Yes MOTOR is the keyword. The Amsoil was designed with all the T-350 requirements and then some. The main difference between the Mopar MTX and the Amsoil SMTX is the Amsoil is FULL synthetic which keeps the oil from sheering out too fast.( breaking down) The Mopar oil is semi-synthetic with a mineral oil base which causes it to break down much faster than full synthetic and it also gets gummy after it breaks down causing deposits.


The Amsoil specifically had better shift engagement and feel, more consistent operation, cooler oil temps.(which translates into cooler tranny), considerably less force needed to shift, quieter operation, longer tranny life, ( bearings, synchros, forks, etc.......) These are the differences between the Mopar MTX and the Amsoil SMTX and there was an even bigger difference between ATF+4 and the Amsoil SMTX. The Amsoil came out on top, the Mopar MTX came a not too distant 2nd and the ATF+4 came in last miles away from the other 2. The Amsoil is cheaper and the availability is greater at $9 a quart and some auto parts stores sell it and you can always buy it online right from Amsoil too.

It's a no brain-er for me which oil I'm going to use from now on.

Hey Mike, you said 100K miles and still going strong but the Mobil 1HM has only been out a year or so. I'm curious how many miles you've put on the tranny since switching to the Mobil 1HM and what oil did you run before switching?

bullet im running liquid gold as ibn them opar stuff thats $11 a qt via the dealer

Update; I'm out. Ran for 2600 miles and pulled tranny to upgrade clutch. Changed fluid to Amsoil. No more "thunkiness" when cold. With the Mobil it seemed to be getting "thunkier" as time wore on (but that could be my imagination). But with Amsoil, smooth as can be right off the bat.

No regrets. Tried the experiment and it just didn't work out for me. But I WON'T go to the ATF!

MB

yea after trying them im staying with the liquid gold