Nv-5600 not happy with oil change.

[AH64ID]

The G56 is an issue because the Dodge recommendation is not the same as the mfgr, that is not the case with the NV5600.

 

[RVTRKN]

The OEM (Mercedes, not Dodge) for the G56 is MobilTrans SHC DC oil and is too thick, I filled mine with it and dumped it at 1000 miles, it attacked the sycro's and refilled it with CKelley1's blend, a 50/50 blend of Mobil Delvac™ Synthetic Transmission Fluid 50 with Royal Purple synthetic synchromesh, so far it's been shifting good.

 

[Wayne M.]

In the link I gave above - to the ultimate NV5600 users thread- RVTRKN, you were well versed in using OEM fluid.

 

[RVTRKN]

Under warranty there's no choice for me, back then, OEM was the only choice for my C&C. But it was not the oil I planned on, past the warranty. OEM for the NV5600 is OK for the most part but OEM oil is not for the G56.

 

[Moose]

I have owned 3 different trucks with the NV5600 and been around more then a few others over the years and I have come to the conclusion that these transmissions are independantly very picky on what lube they like. Two of the 5600's I have owned loved the Pennzoil stuff and only tolerated the other offerings. One refused to operate properly with anything but the Redline MTL. The 5600 in my friends truck seems to like anything he puts in it, another friends 5600 preffers Amsoil.

Each transmission is different and some of them just force you figure out what they like (much like my wife).

As long as the lube oil meets the proper specs it just comes down to what your trans is happy with.

 

[amsoilman]

I used the AMSOIL (MTF) "manual Syncromesh Transmission Fluid" in mt 2003 NV 5600, and filled it to the level of the OEM spec. I sold the truck after 9 years and 100,000 miles to my Grandson, and he still has not drained it out. The transmission shifted very nice. I installed the AMSOIL (MTF) when the truck had 8,000 miles on it.

 

[Tuesdak]

If I am sitting still with the engine running I can row through the gears with the clutch pedal on the floor. Even waiting in neutral I can go back into 3 without any grinding. I verified each oil bottle had the NV-5600 on it and was the same.

If anything the high clutch pedal release IMO would be a worn clutch.

I will wait for the UOA and give this oil 1000 miles. Otherwise I will find out what the dealer charges for the oil. I suspect that's all this trans ever had in it with the last change.

Did anyone ever find out why the transmissions are so sensitive to the brand of oil used? Internal clearances set different? Oil's that different from each other?

 

[RVTRKN]

It's who is rowing through the gears, my NV5600 was tight when cold and when I first got my truck I was always having issues shifting. So I would always warm up the trans by keeping the transfer case in neutral and in 4th gear. I sold the truck to my brother and warned him of the cold transmission issue. After a few thousand miles I drove it to get some coffee, and when I got back I complained about the cold transmission and he raised his voice slightly (he is my big brother) WHAT PROBLEM, it shifts fine for me cold. Same truck, oil and transmission with different drivers and different outcomes!

 

[orhusky]

I found with my 05 you couldn't rush it along. You had to wait on it and it would drop in gear when the rpm's were right. Not a speed shifter at all. It was like you could feel when it was right and plop, in it would go.

 

[Tuesdak]

The day and night difference is going from 'worn out' sheared down oil that was more or less a 10 weight at 100 degrees C. 5.0 cst on the worn out oil replaced with the 9.7 cst AMSOIL. This is double the viscosity hot - what it was cold is unknown.
https://www.turbodieselregister.com...?246204-Anti-Freeze-in-NV-5600-oil-UOA-result

The transmission has trouble shifting cold (no colder than 36 degrees here.) into 3rd by blowing past the syncro and grinding. Double clutching appears to help. So does waiting in the gate before going the final way into gear. It is shifting fine when warmed up some.

 

[Regcabguy]

The 2-3 upshift in my G-56 has always been a bit touchy,cold or warm. I can't just upshift it quickly regardless of rpm's. My friend's '07 is the same way I can downshift into 3rd without thinking. It's just something I've gotten used to.
I drove a RV5600 last week. Although a slower shifting trans overall it exhibited none of the 2-3 issue.

 

[STEVEBROOKS]

Reviving this older thread. I now use my truck almost only for pulling our camper at max weight in the hot NM summer, and am starting to prep it for this year's use. That said, I want to use the best trans oil for those conditions. I've added trans coolers (with finned aluminum end plates) to both sides. What oil have others had success with who use their truck similarly?

Thanks,

Steve

 

[Regcabguy]

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!

Blumenthal fills the G-56 with ATF+4 after a rebuild. I don't know about the NV5600.
The contact person stated to me that they manufacture NV5600 parts in house.

 

[jhenderson]

Factory fill. For 5600 is penzoil synchromesh equivalent.

 

[orhusky]

Reviving this older thread. I now use my truck almost only for pulling our camper at max weight in the hot NM summer, and am starting to prep it for this year's use. That said, I want to use the best trans oil for those conditions. I've added trans coolers (with finned aluminum end plates) to both sides. What oil have others had success with who use their truck similarly?

Thanks,

Steve

I used our 05 with NV-5600 much like you are talking about and had great results with AMSOIL Manual Synchromesh Transmission Fluid and I overfilled it through the shifter with the boot removed as per Standard Transmission. Shifted great!

 

[Tuesdak]

After about 5K miles the trans is now shifting fine with the AMSOIL including the cold snap we went though this winter that gave me the original issue. It took it awhile (relative to low miles put on over time) to get used to it. It has 13K on the oil now. I figure it needs a teardown anyway due to the clutch pedal vibration I get when shifting. One of these days anyway.