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Old 06-26-2013, 08:30 AM   #1 (permalink)
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redline oil for G56

Im looking to switch from my Mobil syn 50w to a redline product. I do not like the way it shifts. its too slow and grinds when cold. It never use to do this. My problem is I cant decide between the MT90 75W90, MT85 75W85, or the MTL 70w80 GL4 oils. From what I read the G56 requires 75-90 from Mercedes, But redline specs the MT85 for dodge truck and NV4500 trans and the MTL for the NV5600 or synchomesh applications. Any experience or info is helpful thanks
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Old 06-26-2013, 11:25 AM   #2 (permalink)
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I thought the Mobil Syn 50w was one of the preferred oils. But you're saying it's not that great. Could it be something else going wrong like the clutch?

See link:

http://www.carbonitecummins.com/Docu...Comparison.pdf

Anyway please post back with your results.

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Old 06-26-2013, 11:31 AM   #3 (permalink)
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never did this until after I switched to the 50w oil. I have the clutch in the truck with atf and it shifted just fine. I want something a little thinner. I have heard good things about redline and want to give it a try
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Old 06-26-2013, 04:56 PM   #4 (permalink)
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I've used MTL in most of my truck boxes for years - it's really good stuff. If the M-B spec is as you say, you probably want to choose the MT90.
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Old 06-26-2013, 08:16 PM   #5 (permalink)
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Gear lube is not just about viscosity. Lube base stock is critical in heavily loaded transmission. Reason Mercedes spec'd a synthetic base stock lube for the G56 in MD real truck apps. read the whole Mercedes spec, it's in German but easily translated.

Vis @ 40C and Brookstone are indicative of cold startup viscosity

Vis @ 100C, cSt is indicative of running at spec temp conditions viscosity.

Higher viscosity lubes provide more film protection between the meshed gears and between bearing components.
It's a tradeoff between shift quality from lower viscosity and transmission protection/long life.

Brookfield Viscosity @ -40C, Poise is another indicator of lube performance at low temps. Lower the #, less the viscosity and gear/syncro drag.

Lower viscosity, especially at cruising temps, reduces gear/bearing drag thus increasing fuel mileage mpg, money in your pocket.


The ester real synthetic base stock in Redline lubes has another advantage, adhesion film to metal bonding.

General Maintenance - Crankcase Oils

Esters have all the advantages of a PAO but more of them. Esters can handle heat better than PAO’s and when burned, esters leave far less coking deposits. Esters are static types of oils and are attracted to metal parts with an electro-chemical bond. This means no more metal to metal start ups. This also means that a film is there before the oil pressure light goes out preventing premature wear of high-stressed parts like cam lobes. The film created is up to 5 times stronger then petroleum oil.

The number one reason to run an ester synthetic oil is bond. The electro-chemical bond is made because the ester molecule is polar. Sort of like a refrigerator magnet. It is attracted to metal and sticks.The PAO molecules are neutral and act like a piece of plastic placed on the fridge. They just fall off. All commercial jet plane flying, use an ester synthetic of some type and not a PAO. You need to run an ester of some sort for maximum protection.




Friction modifiers, antiwear additives and extreme pressure additives types and amounts used in the additive package to the base lube all affect how syncros function, cold and hot. They are not the same between brands of lube oil.

MTL for cold climates and/or NO>Lt. loads
Vis @ 100C, cSt 10.6
Vis @ 40C, cSt 56.2
Viscosity Index 183
Pour Point, C -50
Pour Point, F -58

Red Line Synthetic Oil - Gear Oil for Manual Transmissions - MTL 70W80 GL-4 Gear Oil

MT-85 75W85 GL-4 Gear Oil for med. hvy loads and hot climates
Red Line Synthetic Oil - Gear Oil for Manual Transmissions - MT-85 75W85 GL-4 Gear Oil

Vis @ 100C 12.0
Vis @ 40C 64.3
Viscosity Index 172
Pour Point, C -48
Pour Point, F -54


I would not use the MT-90 75W90 GL-4 Gear Oil
except in the hottest climates towing max. loads. too much gear drag from the high viscosity.
SAE Viscosity Grade (Gear Oil) 75W90
Vis @ 100C, cSt 15.6
Vis @ 40C, cSt 90
Viscosity Index 185
Pour Point, C -45
Pour Point, F -49
Red Line Synthetic Oil - Gear Oil for Manual Transmissions - MT-90 75W90 GL-4 Gear Oil

Mobil Delvac Synthetic Transmission Fluid 50
I'd only use to reduce gear/shaft chatter if objectionable after conversion to a non DM clutch.
SAE Grade 50
Viscosity, ASTM D 445
cSt @ 40C 132
cSt @ 100C 17.5
Viscosity Index, ASTM D 2270 146
Pour Point, C, ASTM D 97 -45


Putting the Simple Back into Viscosity - Bob is the Oil Guy
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Last edited by steelhead01; 06-26-2013 at 08:21 PM.
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Old 06-26-2013, 10:31 PM   #6 (permalink)
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Maybe i should try draining a qt or two of the 50wt and mix it with synchromesh then? I just want it the shift a little better.
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Old 06-26-2013, 11:09 PM   #7 (permalink)
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I run redline c+ ATF in my g56. 7 quarts have to pull the shifter to get the last quart. 2.5 in the transfer case. Runs great for the past 25 k
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Old 06-26-2013, 11:15 PM   #8 (permalink)
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Synchro mesh is for the nv trannys. The g56 requires ATF I believe. I researched a lot on here and mAny people think the extra quart( 7 total really helps)
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Old 06-26-2013, 11:16 PM   #9 (permalink)
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I run a gallon of Delvac and 3 qts of Amsoil 5-30 synchromesh. Somewhat stiff after sittin overnight,even here in San Diego. To be honest,the truck shifted great w/ Amsoil ATF or Pennsoil synchromesh. After 20K with each, fluid looked like new and magnet had minimal fuzz. Just can't stand the marbles rattling around under the floorboard after the dmf was replaced.
I wish somebody'd come out with an iron case or a 60 hp+ DMF that would survive a 100K. I miss that silent,great shifting stock setup.

steelhead01,
What would your recommendation be for a smf converted G-56?
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Last edited by Danderson; 06-26-2013 at 11:18 PM.
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Old 06-26-2013, 11:24 PM   #10 (permalink)
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Quote:
Originally Posted by megacabsledder View Post
Synchro mesh is for the nv trannys. The g56 requires ATF I believe. I researched a lot on here and mAny people think the extra quart( 7 total really helps)
Which clutch are you running?
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Old 06-27-2013, 12:16 AM   #11 (permalink)
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Vailair organic duel disc
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Old 06-27-2013, 07:40 AM   #12 (permalink)
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I believe southbend came out with a street dual disk clutch that is nice shifting and doesnt rattle your brains out.
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