Manual transmission oil type? Will this mobile 1 be ok?

[darknezz7]

Ive seen everything from redline, royal purple, the bg stuff is said dealer and best, reguar 75-80w gear oil

I'm wondering if this mobile 1 75-140 synthetic will be ok for awhile? we can change it later but I have this already and need something to put in the car. I also have regular gl5 80-90

Or can someone tell me something cheap we can use for a bit?

 

[turtlebain]

Always used Penzoil Synchromesh with good results. It's fairly cheap as well.

 

[pauleyman]

Use the gl spec for your tranny. And 140 isnt it. Everybody has an opinion on brand.

 

[mercaholik]

Yes opinions aside if you don't run the right gear oil the trans really won't want to shift at higher rpm's. I personally think less of Mobil one after reading that on 560+ hp twin turbo 300zx's loud ass gear box was rendered silent by changing to redline from Mobil one plus it's always so thin when I drain it.

 

[lasthope05]

140 weight gear oil will work fine in the warmer months and in high horsepower applications but come winter time or in cold weather you need to change it back to standard 75w90.

 

[jbeaton9292]

I will never use anything but redline mt90 in trans and redline heavy shockproof in my tcase i was told our trans doesnt like syncromesh at all in fact was told from a friend that was using it in a car he had just picked up guy put that in it he claimed the trans felt very notchy and was just sloppy feeling we put some redline as i said i use qnd thing shifted like butter from then on like a new trans is pricey but beyons worth it maybe because im a little girl when it comes to a trans they scare me as i dont know anything aboit inside them so i want it to last (haha dsm trans last that was funny)

 

[Torpedo]

GL-4 Redline MT-90 for my tranny,
Redline lightweight shockproof for my T-case and Rear Differntial.

GL-5 is not good for our tranny.

 

[DSM1G90]

GL-5 has sulfur in it and will eat up the brass syncros. GL-5 is a gear oil for the RWD rear ends.

I use MT-90 in my tranny, but standard 75/80w 90 is good all year around...and inexpensive.

Syncromesh stuff is too thin. You may shift easier, but gear protection it isn't.


And, you don't put any of this stuff above in a 420A manual or automatic tranny. It's a Chrysler and it's picky on fluid. Thus an ATF+4 compatible fluid is needed.

 

[darknezz7]

Hm ok, I know older cars u use gl5 in the trans and diff, thought id ask figured it would not be good, hence asking before putting it in. The mobile was purchased for my sisters bmw diff but then I put redline in it. I have redline in my bmw trans and diff as well.

Guess we are getting redline, how many bottles, 3?

 

[XFinisher]

I just tried the Royal Purple Syncromesh in my bimmer and I really am not happy with it. Ill be going with Redline MT90 in the DSM for sure.

 

[darknezz7]

I just tried the Royal Purple Syncromesh in my bimmer and I really am not happy with it. Ill be going with Redline MT90 in the DSM for sure.

funny I put that in my gfs 530 6 speed and was not happy either and will be swapping to redline.

Would it damage anything to start it just for a second with no fluid in the trans? literally just a second to see if it starts.

 

[jbeaton9292]

Yes 3 bottles of mt90 for just trans 1 more bottle as i said heavy shockproof for the tcase

 

[XFinisher]

funny I put that in my gfs 530 6 speed and was not happy either and will be swapping to redline.

Would it damage anything to start it just for a second with no fluid in the trans? literally just a second to see if it starts.

I would not start it, could very easily damage the bearings IMO. I ran Redline in my RX8 but that car had some serious transmission issues so I cant blame the oil for anything and unfortunately was unable to get a good feel for it.

 

[darknezz7]

darn I really wanted to start it just for a sec...

 

[XFinisher]

Well, if you hold the clutch in and put it in gear so the transmission does not spin you should be fine.. That is if the car is on the ground with all 4 wheels . Do not put it in neutral or let the clutch out this will cause the transmission to spin and possibly severely damage your bearings. With the car in gear and clutch disengaged it will allow the motor to turn without affecting the transmission. You are best off just waiting until you have fluid in the tranny but if you really want to you can do this.

 

[Maes]

I've just always used the penz synchroshift and I do notice that it is a little notchy not much but a little. will the redline clean that up?

 

[turtleb00st]

A lot of tranny builders recommend factory Mitsu diaqueen, either straight or mixed with redline. Talk to your builder and see what they recommend. If it's stock just buy factory fluid

If u need something asap the penzoil synchromesh will suffice

 

[darknezz7]

its a FWD, the fronts off the ground

that the other problem im having is the clutch will just not bleed. It starts to get firm but then goes bunk and I keep bleeding and keep getting air pockets. I've spent hours on it so I deem bad mast cyl, it has new slave.

 

[92AWDHX40]

Only redline for my freshly built trans.

 

[GST with PSI]

The Mitsu FSM says any API GL-4 or GL-5 lubricant with a viscosity of SAE 75W-85W. It's common to run a 75W-90W, though.

Even though the manual says you can, your synchros won't last if you run 75W90 GL-5 Gear Oil. It is for differentials and such. It's too slippery for synchronizers, and will result in notchy shifting ultimately destroying them. Right from Red Line's site in regard to running their 75W90 GL-5 Gear Oil in transaxles: click

This product is not designed for use in most manual transmissions or transaxles in passenger vehicles, since the extreme slipperiness may cause synchronizer mesh issues that lead to shifting problems

In addition, and as already mentioned, GL-5 is corrosive to brass synchros.

On the flip side, Synchromesh is too thin if you ask me. Sure your trans will shift great, but it offers little protection for the gears compared to some of the other oils on the market. I wouldn't recommend running Synchromesh in any transmission I cared about.

Of course, everyone has their own opinion about what's best. Redline is a proven brand, that has worked well for tons of people here. Redline is what I use. NEO RHD is also good IMO.

AWD manual trans: 2.4 quarts Redline MT-90
Transfer Case: .53 quarts Redline Heavyweight Shockproof
Rear Diff: .9 quarts Redline Heavyweight Shockproof

Pro tip for filling the trans: remove the speedo gear and get one of those long transmission fluid funnels. Stick the long transmission funnel (or a typical funnel with a hose attached) into the speedo hole, and then dump in exactly 2 1/2 quarts of MT-90 (spec is 2.4 qts). It will save you the hassle of pumping it in and screwing with the fill plug.

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[darknezz7]

thats a great idea about the spedo sensor hole.

is it the same amount for FWD trans?

oh and I still tried to start it, I would just like to hear even a slight stumble of a start, would not even idle it a second. I have spark but no injectors

 

[Maes]

Thank you for the information nice post

 

[GST with PSI]

thats a great idea about the spedo sensor hole.

is it the same amount for FWD trans?

oh and I still tried to start it, I would just like to hear even a slight stumble of a start, would not even idle it a second. I have spark but no injectors

The fill spec for the FWD trans is 2.1 quarts. I'd drop in 2 quarts and call it good.

And what do you mean you have no injectors. Can you elaborate a bit more?

Thank you for the information nice post

No worries, glad to help.

 

[jbeaton9292]

I've just always used the penz synchroshift and I do notice that it is a little notchy not much but a little. will the redline clean that up?

hard to say if it will i would say yes it will help you out redline is some good quality fluid forsure

 

[Maes]

hard to say if it will i would say yes it will help you out redline is some good quality fluid forsure

Thanks J I'm going to try it out after winter. Winter up here is pretty brutal so the car stays in the garage