*Synthetic differential oil

12-25-2005, 11:47 AM

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Last edited by MR4WLR : 03-23-2007 at 04:39 PM.

AZBLACKSMOKE · 12-27-2005, 07:34 PM

I too had some good results with synthetic diff lube. While changing all the oils in the entire truck..a ritual I always perform when I take ownership of a unfamiliar vehical, Anyway, I drained the old nasty dino out which was black and bubbly, and swapped it with some Shaeffers 70w90 with Moly. I couldnt believe how slick this stuff was! And sticky too. The only bad thing was it was already black brand new, so I wrote down the mileage in my glove box thingy. Anyway, You might think I am trippin out and smokin crack, but see, my truck doesnt have a bed yet, and when I take off in the gravel I ease her with the throttle...too much and I just get wheel spin...anyway, after the moly treatment, It spins no matter how easy I try to take off in the gravel...it is dang hard to get her going. So much, that now I make it a point not to stop in gravel or dirt. So that tells me shes turning a bit easier....call me crazy, but I know what I feel. Just my :imo: on the subject of synthetic oils.

__________________
2001 Chevy Xcab,4x4,LB7/Allison, Straight4in, predator.
Previously a 12valver...

illflem · 12-28-2005, 08:49 AM

I used Royal Purple in my differentials for quite some time but recently switched to Schaeffer's. It looks better for whatever that's worth.

One thing I noticed back when I ran dino in the differentials is that when it got down below zero my truck didn't coast to a stop very well, sometimes I had to give it a little pedal to make it the last twenty feet before stopping. Not so with synthetic.

__________________
Bill
'95 2500 4wd auto
'95 3500 5 speed heavy hauler
Both far from stock

rapom · 12-28-2005, 11:18 AM

I would thin my gear oil with Marvel mystery oil when I lived in N.D. and MT.

__________________
1999 2500 Reg Cab(Coupe) 4x4, Long bed, 4spd auto, 4:10s, straight piped, BHAF, on board battery charger, 8.5ft SUNLITE slide in camper

12-25-2005, 11:47 AM	#1 (permalink)
Guest Posts: n/a	Synthetic differential oil Tech articles are in the process of being restored, please bear with us during this process Cummins Forum Staff Last edited by MR4WLR : 03-23-2007 at 04:39 PM.*

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12-27-2005, 07:34 PM	#2 (permalink)
AZBLACKSMOKE Tech Specialist Join Date: Nov 2005 Location: S.E. Arizona Posts: 395 AZBLACKSMOKE's Truck Pics	I too had some good results with synthetic diff lube. While changing all the oils in the entire truck..a ritual I always perform when I take ownership of a unfamiliar vehical, Anyway, I drained the old nasty dino out which was black and bubbly, and swapped it with some Shaeffers 70w90 with Moly. I couldnt believe how slick this stuff was! And sticky too. The only bad thing was it was already black brand new, so I wrote down the mileage in my glove box thingy. Anyway, You might think I am trippin out and smokin crack, but see, my truck doesnt have a bed yet, and when I take off in the gravel I ease her with the throttle...too much and I just get wheel spin...anyway, after the moly treatment, It spins no matter how easy I try to take off in the gravel...it is dang hard to get her going. So much, that now I make it a point not to stop in gravel or dirt. So that tells me shes turning a bit easier....call me crazy, but I know what I feel. Just my :imo: on the subject of synthetic oils. __________________ 2001 Chevy Xcab,4x4,LB7/Allison, Straight4in, predator. Previously a 12valver...

12-28-2005, 08:49 AM	#3 (permalink)
illflem Moderator Join Date: Nov 2005 Location: Montana Posts: 1,216 illflem's Truck Pics	I used Royal Purple in my differentials for quite some time but recently switched to Schaeffer's. It looks better for whatever that's worth. One thing I noticed back when I ran dino in the differentials is that when it got down below zero my truck didn't coast to a stop very well, sometimes I had to give it a little pedal to make it the last twenty feet before stopping. Not so with synthetic. __________________ Bill '95 2500 4wd auto '95 3500 5 speed heavy hauler Both far from stock

12-28-2005, 11:18 AM	#4 (permalink)
rapom Cummins Fan Join Date: Dec 2005 Location: N.C. Posts: 96 rapom's Truck Pics	I would thin my gear oil with Marvel mystery oil when I lived in N.D. and MT. __________________ 1999 2500 Reg Cab(Coupe) 4x4, Long bed, 4spd auto, 4:10s, straight piped, BHAF, on board battery charger, 8.5ft SUNLITE slide in camper