[dgc333]

FWIW, 75w hypoid gear oil is approximately the same viscosity at room temp as 10w motor oil. You can't compare viscosity of gear oil and motor oil by the SAE rating.

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[22593]

If I understand correctly, the transmission fluid and hydraulic fluid are different fluids and not interchangeable despite both being SAE 75W API GL4 fluids.

while they are both 75w one is HYDRAULIC FLUID, and one is API GL4 A minor difference in title that could cause major damage.

So after digging... a LOT.... still no concrete answer on this. Email sent to Dodge, will post when they reply.
Thanks for the input everyone.

 

[alpinegreenneon]

I was helping another forum member in another thread:
http://www.dodge-dart.org/forum/dodge-dart-gt/45433-how-my-gt-has-gone-so-far.html

Found this NOTE in the FSM:

NOTE: If a fluid with anti-friction additive is used in a C-365 transmission the synchronizers will fail, requiring synchronizer replacement.

This is what I was referring to when I mentioned the T850 SRT4 trans. Since you have NO IDEA what is in the formulation of universal compatible 75W fluids, why risk it????

 

[22593]

I understand what you're saying about potential damage caused by not running the right lubricant.

Still haven't heard from Dodge/FCA about options for aftermarket oils. *Shock* I did however find a company in the uk called Morris Lubricants that has a DCT formula that supposed to be compatible with the C635, http://www.morrislubricants.co.uk/products/auto/gear-transmission-oils/multitrans-dct.html
This could be really good news. Wouldn't run this brand, but it gives me hope that others will also work. Will keep you guys posted. Thanks for everyone's help.

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[PBMTMD]

Royal purple suggests their Synchromax transmission fluid is compatible. Link to the cross reference here.

They state this fluid is compatible with all friction materials (which implies they don't use any anti-friction additives) and that it is safe with soft metals found in some transmissions. Product description here.

 

[alpinegreenneon]

Out of curiosity, I looked up a price comparison.
@AllMoparParts.com
Fluid-C series transmission - Mopar (68092630AA)
List Price: $31.20 You Save: $9.69 (31% off) Sale Price: $21.51

Amazon
Royal Purple 01512 Synchromax High Performance Synthetic Manual Transmission Fluid - 1 qt.
Price: $19.15

Then I looked closer at what the link for the Royal Purple says and read this:
"Synchromax is recommended for manual transmissions that specify an automatic transmission fluid."

Automatic transmission fluid is more like a 5W30 motor oil not a 75W! The SRT4 Neon had ATF+4 from the factory and likely they are referring to that application. So who wants to save $2.36/qt and put possibly the wrong fluid in their trans?

 

[22593]

Dude, I don't want to run the factory fluid. It wasn't designed for any kind of heavyduty/performance application. Based on some of the transmission horror stories I've seen on here, it doesn't sound like the factory fluid is very good.

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[alpinegreenneon]

But the Dart is not really a performance car. The SRT version that never happened would have been a performance car. Why are you so sure that the problems with the manual trans are caused by the factory trans fluid? From my reading it seems like the CDV (clutch delay valve), the rear mount, and dealer incompetence are the actual problems.
Dude?? Can a 69 year old guy be a dude?

 

[22593]

Found some white papers on why aftermarket is better than stock fluids. I also understand that this isnt tests of the fluid I want to replace.
https://www.google.com/url?sa=t&rct...senseoil.com/G2457-GearOilWhitePaper.pdf&usg=AFQjCNHHHSLgrj6HbkTaP0o5TXd3WEqnYA

 

[Jetronic]

Fluids that have been ound to work well in Giuliettas (with the same C635 transmission) are:

Castrol syntrans Multivehicle 75w-90 GL4
Fuchs Titan Sintofluid FE SAE 75W

and the factory fill is Tutela Transmission Gearforce. that's a 7.1 cSt fluid at 100°C.

People are running overfilled gearboxesif they see more heavy use than just commuting. Since bottles are typically 1 litre, they dump in 2 bottles for a slight overfill.

I'll be changing to Castrol this summer, in my DDCT.

Red Line MTL would be a suitable candidate (especially in cold regions) as the cold viscosity is the same at -40° as the original fluid, as is the pour point. MTL is however thicker at operating temp which isn't an issue. Even Castrol which is double the viscosity of the original fluid at 100°c/212°F shits better. MTL however is rarer than hens teeth in Europe, and costs at least twice what the others cost.

 

[22593]

Thank you, sir.

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[alpinegreenneon]

All those trans fluids, Castrol Syntrans Multivehicle 75w-90 GL4, Fuchs Titan Sintofluid FE SAE 75W, and Tutela Transmission Gearforce, are in Europe, except the Red Line MTL. You can find info on all searching google. Good luck.

 

[Exitus04]

So I'm at about 50k miles now still running the factory transmission fluid... (I know, I know don't yell at me!) I noticed today driving that the feeling in the shifter is getting "different" and feels a bit sticky (for lack of a better word)After reading this thread completely and researching the different fluids out there... I feel as though a better transmis sion fluid might be a better idea for a daily driven and tuned dart. I am going to give the royal purple 01300 75w-90 a shot and see how it feels. I'll try and post some stuff when it comes in and let you guys know how it goes!

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[dgc333]

I would go with the Royal Purple SyncroMax. It is made for manual transmissions and made a noticeable improvement in the shifting of my 15

 

[22593]

+1 on the Syncromax

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[Bullfrog]

I would go with the Royal Purple SyncroMax. It is made for manual transmissions and made a noticeable improvement in the shifting of my 15

+1 on the Syncromax

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Are you both running the syncromax now?

 

[22593]

I am, and have about 2k miles on it since the change.... Love it!

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[Exitus04]

I went ahead and changed my transmission fluid this weekend with the Royal Purple GEAR-MAX 01300... And boy o boy, what a difference! The feeling in the shifts are much smoother, it feels like the transmission glides into gear much better and i dont have as much jumpiness in the transitions from 1st to 2nd or 2nd to 3rd... I think this fluid is going to be great and last a long time! It also kinda feels like the pull on acceleration is much smoother as well! I would recommend this fluid to anyone with the manual transmission looking for a great replacement!

That being said, It was kind of a PITA to change the fluid. Of course Dodge HAD to use another awkward tool for the drain plug and the damn FSM doesnt tell you what size allen wrench you need. Idk if its the same for all manual transmissions but mine had a 12MM allen wrench plug, which you had to use a SHORTY or else you wont get a socket wrench in there!

then once the fluid was completely drained, I had to use the clear rubber hose that deyeme gave with the CDV delete kit in order to fill the transmission back up because there is NO way to get a bottle down in there to fill it. I did clean the hose out with brakekleen then washed it real good with water and blew it out with a compressor to make sure there was no brake fluid or brakekleen left in it... The only thing that is kind of difficult is making sure the hose stays in the filler hole while youre filling it up! I would recommend a partner or maybe a piece of tape to hold the hose somewhere so that it doesnt jump out. The 1.4T uses about 1.8QT. in the transmission and I think that is the same for the 2.0 & 2.4...

I think the part that was the most troublesome was following the FSM when it came to the way they describe the make-shift dipstick you have to create. Here's how you do it!

1. Measure 15mm on a business card

2. Cut the strip out length wise

3. Measure 30mm from one side of the strip

4. Bend the strip at a right (90 degree) angle on that line

5. Measure from the 30mm side back 15mm (that will be you fluid line)

Then you hold the long side and put the short side with the fill line on it into the fill hole of the transmission and hold it flush to the bottom of the fill hole and push down so the short side (with the fill line) dips down and in an little into the transmission case.

If the fluid meets that line you are perfect!

 

[Renault_Encore]

Has anyone ever tried AMS OIL Syncromesh in the Manual Transmission Darts? I did not get what the proper weight of oil to use would be the best.

 

[22593]

Has anyone ever tried AMS OIL Syncromesh in the Manual Transmission Darts? I did not get what the proper weight of oil to use would be the best.

I have not, but for what it's worth I did send them an email on the subject. They flat out said "at this point in time they do not have a fluid that meets Dodge/Fiat specifications." Which is why I went with the Royal Purple.

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