*Synthetic differential oil for cold weather - NS

What the heck is it with all this cold weather stuff Well its fixin to get cold so lets get those trucks in good working order for winter eh!

The Oil in the rearend of our trucks is a dino oil (Mineral Based Oil) and in my oppinion leaves alot to be desired for differential use, first off I totally dont understand this but D/C actuaaly recommends that if you are going to tow with your Dodge/Cummins that you change the rearend oil over to a full synthetic 75/90 wt. OK i have to agree with them BUT What the heck to they mean Tow with your Dodge/Cummins truck??? Do they actually think that people wont tow with this truck Heck that is what they were born to do in this world hehehehehehe, Anyway I have yet another gauge to monitor rearend temps and when I had the dino oil in the rearend and was in tow I could reach 190*F this temp is still within a tollerable range but when I put the full Synthetic 75/90 in there I havent had it past 170*F since..............so what does that tell us? It tells me there is a whole lot less friction goin on in there eh. Here is a little experiment for ya, this winter when it is as cold as it gets in yer parts take some dino 75/90 and some syn 75/90 and pour about an ounce of each on a small plate and let them set outside till morning, then go out there and pour the oil off the plate..........what you say the dino wont come off, yep its true and the syn will pour righ toff there, now think about that and what yer gears are trying to do with that thick stuff in there. Thin about how much HP it takes every single cold morning to chern thru that thick stuff, that translates to extra fuel usage inturn means less beans for the dinner table. So do yer truck a favor and switck the differential oil over to a full synthetic and change that oil every 30k miles............go ahead and do the front diff while yer at it, only change that oil with respect to how much you use it though. One tip one the rearend is you have to drain the oil from the punkin and then jack up one side of the truck at a time to tilt the axle tubes so the will drain completly. If you dont have a drain plug the diff cover will need to be removed, the torque spec on the cover bolts is 47 ft. lbs. tq. I scrape the cover surfaces clean and buff with light emery cloth then add a coat of permatex red silicone and bolt er up using a star or criss cross pattern, I like to go to 35 ft. lbs first then step up to the 47 ft. lbs. required, also if you have a limited slip rearend the use of friction modifier may be needed, usually a couple ounces but I would tru the full synthetic and see how it works first, if it chatters on a corner then add the modifier.

Cheers, Kevin

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Last edited by Andy : 03-24-2007 at 02:57 PM.

Cold stuff is on us now men

[TEX]

whitmore thanks for all the time you put in to CF and again for the great info.

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[Buddah]

Definitly worth it in cold climates. How many quarts does it take?

[noplugs4me]

Originally Posted by Buddah

Definitly worth it in cold climates. How many quarts does it take?

Ask and you shall receive. Straight from the AMSOIL application guide. -Jason


Differential, with Dana 60 Front..........8.4 pints[2]
Differential, with Model 194 F/A Front..........3.0 pints
Differential, 2WD with Dana 60 Rear..........6.3 pints[3]
Differential, 2WD with Dana 70 Rear..........7.0 pints
Differential, 2WD with Dana 80 Rear..........6.8 pints[4]
Differential, 4WD with Dana 60 Rear..........7.2 pints[5]
Differential, 4WD with Dana 70 Rear..........7.6 pints
Differential, 4WD with Dana 80 Rear..........10.0 pints
Differential, with 7.25 ring gear Front..........3.0 pints[5]

Differential, with 9.25"AA Front..........4.9 pints[6]
Differential, with 9.25 ring gear Rear..........4.4 pints[7]
Differential, with 10.50 ring gear Rear..........5.3 pints[8]
Differential, with 11.50 ring gear Rear..........7.6 pints[9]
Differential, with Dana 60 Rear..........5.9 pints[9]

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