G56 Trans

[jlwelding]

A friend wants me to order Amsoil 50-w trans fluid for his 2015 G56 trans. all I see is ATF being ran. Should he do 5o-w fluid?

[Mopar1973Man]

As long as its GL-4  rated synthetic I don't think there will be any problems. Just remember that 50 weight is equal to 90 weight gear lube. 

 

[AH64ID]

16 hours ago, jlwelding said:

A friend wants me to order Amsoil 50-w trans fluid for his 2015 G56 trans. all I see is ATF being ran. Should he do 5o-w fluid?

 

 

The proper Amsoil GL-4 fluid for the G56 is the MTG 75w-90 manual transmission fluid. 

 

http://www.amsoil.com/shop/by-product/transmission-fluid/manual/manual-transmission-and-transaxle-gear-lube-75w-90/?code=MTGQT-EA

 

From the research I have done it's the closest to the Mercedes OEM fluid as we can find right now. I have sold it to several G56 owners with excellent results. 

 

 

 

Don't have him run the syncromesh MTF. Syncromesh is not a GL-4 fluid. 

 

[jlwelding]

Now he's ordering some coolers to run on the trans. This all started yesterday when he used my temp gun to check trans temp after hauling a lite 4 ton load of fertilizer. the PTO plates were 200 degrees. Thanks Guys

[TFaoro]

13 hours ago, AH64ID said:

 

 

The proper Amsoil GL-4 fluid for the G56 is the MTG 75w-90 manual transmission fluid. 

 

http://www.amsoil.com/shop/by-product/transmission-fluid/manual/manual-transmission-and-transaxle-gear-lube-75w-90/?code=MTGQT-EA

 

From the research I have done it's the closest to the Mercedes OEM fluid as we can find right now. I have sold it to several G56 owners with excellent results. 

 

 

 

Don't have him run the syncromesh MTF. Syncromesh is not a GL-4 fluid. 

 

^^^^ This 100%!! I love the way mine shift when it's cold and when it's hot. I just need to get around to buying a temp gauge so I know summer hauling temperatures. 

[Cowboy]

Forgive me if I'm wrong.  But Mercedes recommends a 50W fluid.  The closest obtainable fluid to their spec is a Mobile Delvac 50 (SAE 50).  However It's fairly thick and doesn't shift very well, especially cold.

 

 

I'm personally thinking on trying a redline product.

 

 

I'm currently running the CD-50.  I've hauled 14k trailer weight running 65 mph and all sorts of other bullshitery and the highest I've seen was 160°F oil temp.  At some point I'll be hauling a lot of weight at low speeds, I'm curious to see how it does then.  

Edited June 26, 2017 by Cowboy

[AH64ID]

MB calls for spec 4 different specs. 235.1 for temperate zones, 235.12 for all zones but temperate, or 235.13 and/or 235.41 for all zones. 

 

235.1 is a GL-4 80wt oil

235.12 is a GL-4 140wt oil

235.13 is a GL-4 SAE 50wt oil. 

235.41 is a GL-4 75w-90 oil

 

So it looks like GL-4 is what it calls for. The Mobiltrans SHC DC is the only fluid that met 235.13. It's been discontinued and very little is known about it. I am not sure if it was a straight SAE 50wt or not. 

 

Mobil Delvac 50 is a MT-1 rated oil that claims it can be used on GL1-4 but it doesn't carry the GL-4 rating. MT-1 is a non-syncromesh manual trans rating. 

 

Personally I'd run a GL-4 and not a MT-1 if I owned a G56. 

 

I have read several reports of Delvac 50 being difficult in the winter. This isn't surprising given it's MT-1 and straight SAE50 ratings. I have no clue how it became so popular.. must be the herd mentality. It's not difficult to find the specs from MB and that points to GL-4 across the board. 

 

People are also using Delvac 50 in the NV4500 which also clearly calls for a GL-4