Nv-5600 not happy with oil change.

[Tuesdak]

Uh-ho. Opened a can of worms.
I just changed the Oil on the NV-5600 with AMSOIL Synchromesh and added the FASS coolers. Added 8.5 quarts as I used 1/2 quart to flush the bottom of the trans out. Magnet was covered and a fair amount of stuff on the bottom of the trans. Silver oil would drain out the hole if you disturbed the bottom to scrape it out. History is an oil change at 50K and 102K on it now. (From towing use it should have had oil done at 25K from the manual severe service schedule.) The filter kit just went on my wish list for sure...

It shifted slow before however it was ok. Almost wanted some encouragement to go into gear like you had to fight it.

Now it flat hates the AMSOIL from the first shift. Instant night and day shift feel change. The very first shift it went from 2nd to 3rd and was catching the dogs to where you feel it in the shifter via a kicking. 4th refuses to drop in at times and you can catch the dogs on 5th. It feels like it moves through the syncro's faster than it did before - almost too fast. A pause appears to help before going all the way into gear - something it did on it's own before the oil change. It didn't feel like it was catching the dogs before the oil change. (Like gear grinding, but, this trans isn't grinding gears as that doesn't apply to this design.)

I will have a UOA coming back from the old oil.

Sitting still with the engine running I can grab every gear without issues. Clutch engages near the top of the pedal.

Maybe this is how it is supposed to shift without the excessive fight? How long should I run the AMSOIL before going back to the OEM fluid? (Advice from trans shop was to run it awhile.) Is the overfill slowing the trans down too fast? Did pulling the shift tower change something? The plastic bushing on the shifter appears to be loose. The shifter rubber bushing making this trans feel like a an old h*** is another thread on it's own. A tack weld is in it's future. No wonder I can't feel the gates very well.

 

[Joseph Donnelly]

I like Torco RTF and 6-7 qt. max with coolers, but then I also have the Standard Trans Power Lube Package to protect the rear mainshaft bearing. The main reason for overfilling with oil is to try to get oil to that bearing.

 

[Prairie Dog]

If it reacted that bad to the change I would replace it immediately with the correct stock fluid.

Scott

 

[AH64ID]

I run 9 qts of the Amsoil with the fast cooler and my NV-5600 shifts better than most. I do get a little more gear rattle with 9qts vs 7qts and will probably drop to 8 this spring.

Are you sure the proper fluid was added? Maybe it's not the syncromesh.

 

[BLNRAY]

RoyalPurple Synchromax 75w-90,have used since first change,change at least every 50,000,you will feel the difference.

 

[Woodenhead]

I've been using Redline MTL which has been working well. I am getting ready to change the fluid and filter again and will once again use Redline.
You may find it takes a couple changes to get it all out and get the shifting back where you want it. If Amsoil recommends this fluid for the 5600 I'd be calling them to complain. That's a lot of bucks for oil only to have it not work for you.

 

[Wayne M.]

I've been using pennz synchromesh since new. Never a problem. Not doubting there's an oil problem, the comment about the clutch grabbing at the top of the pedal in the OP may suggest an issue there. Lack of clutch disengagement would definitely give these problems.

 

[jeepit]

I just ran out to the garage to verify that I used Amsoil Manual Transmission Fluid 5W30. Last fill I parked it facing downhill next to the barn and added as much as I could get into the case. I have been using this lube since 2002 on my truck with good results.

 

[orhusky]

I used AMSOIL in my 05 NV5600 with great results! It shifted better after I changed it over. I overfilled with 7.5 or 8 qts with fast coolers as I remember.

 

[RVTRKN]

Synchromesh is to thin for the NV5600, is it not? I never changed the oil in my 04.5 at 70K miles, but synchromesh is way to thin, I'd do a little more research in the NV5600 oil requirement. Synchromesh is good for the G56 replacing ATF+ as the standard oil requirement.

 

[Wayne M.]

Isn't Pennz syncromesh the factory fill?

https://www.turbodieselregister.com/forums/showthread.php?226236-The-Ultimate-NV5600-Users-Thread&highlight=pennzoil+syncromesh

 

[AH64ID]

Synchromesh is to thin for the NV5600, is it not? I never changed the oil in my 04.5 at 70K miles, but synchromesh is way to thin, I'd do a little more research in the NV5600 oil requirement. Synchromesh is good for the G56 replacing ATF+ as the standard oil requirement.

Syncromesh IS the correct fluid for the NV-5600. Research huh??

Syncromesh is a common replacement in the G56, but it does not meet the Mercedes specs.

 

[RVTRKN]

RoyalPurple Synchromax 75w-90,have used since first change,change at least every 50,000,you will feel the difference.

As I stated, I never changed the oil in my NV5600, but the oil should be heavier than pennzoil synchromesh like the quote above, I'll know in the near future what it is because I'm dumping the G56 for a NV5600.

 

[AH64ID]

As I stated, I never changed the oil in my NV5600, but the oil should be heavier than pennzoil synchromesh like the quote above, I'll know in the near future what it is because I'm dumping the G56 for a NV5600.

Syncromesh, syncromesh, syncromesh...

Get the point yet?

Anything heavier will damage the the syncro's. But try it if you want.

 

[RVTRKN]

I'm, I'm, I'm clear now, but I will research it anyway. As I found out, ATF+ for my G56 required by Dodge is a lot lighter than the Mercedes requirement, and the blend that CKelly1 uses has proven to be a good replacement that I'm currently using now. I will probably go with the recommendation that Blumenthal recommends, and to be clear about this, I don't know what that is!

 

[Joseph Donnelly]

Pennzoil Synchromesh is the factory type lube for the NV5600. I still prefer Torco RTF for all my standard transmissions. TDR did a report a few issues ago on lubes for the G56, and two Mobil brand lubes were the best.

 

[RVTRKN]

I remember that article but not the Mobil oil recommendations, was one of them "Mobil Delvac™ Synthetic Transmission Fluid 50" and the other was Mobil Trans SHC DC?

 

[GCroyle]

From my 2005 owners manual page 396, Manual Transmission Fluid NV5600 Mopar P/N 4874464

From a bottle of Pennzoil Syncromesh MTF, For use in M/T's requiring ....... and Chrysler Part No. 4874464

The OP inquired about an NV5600, shouldn't the comments be based on the NV5600 too?

 

[orhusky]

From the AMSOIL web site on their Manual Synchromesh Transmission Fluid 5W-30

Applications Recommended for automotive and light-truck applications that require synchromesh transmission fluid. Applications include manual transmissions and transaxles such as New Venture NV T350, NV 1500, NV 2550, NV 3500, NV 3550, NV 5600,

Part Numbers

GM 12345349 or 12345577
GM 12377916
GM 1052931
Chrysler 4874464
Chrysler 4874465

 

[RVTRKN]

From my 2005 owners manual page 396, Manual Transmission Fluid NV5600 Mopar P/N 4874464

From a bottle of Pennzoil Syncromesh MTF, For use in M/T's requiring ....... and Chrysler Part No. 4874464

The OP inquired about an NV5600, shouldn't the comments be based on the NV5600 too?

The point is, that the OEM recommended oil can be different than what is better than OEM, thats why the G56 conversation comes up. Automatic transmission oil in a manual transmission is weird and has been replaced by a better proven blend in CKelley1's fleet of G56's, so if that's possible, are there any better oils for the NV5600, besides the OEM oil? IMHO we are on topic with the OP's post.