Engine/Transmission (1998.5 - 2002) Dana 80 Lube

[A Hermann]

Need some advice. I am going to install a Mag-Hytec Dif cover. Do you guys endorse the factory recommendation of using SAE 75W-140? If I use AMSOIL Series 2000 Synthetic Gear Lube do I have to add a friction modifier? Thanks for the help.

 

[Rob Thomas]

I put in Amsoil 75w-140 in mine , and didn't add any modifier, thats just me though.



Later, Rob

 

[amsoilman]

Hermann,

I personally think the 75W-140 is "overkill" especially in a synthetic lube such as the Amsoil. If you use the Amsoil 2000 series lube, you should not have to install any other additive. However, some have added the friction modifier, some have not. One thing you must do when you change out the lube is go to a parking lot and make some real tight figure 8 turns. This action will work the lube into the clutches and disks. If after doing this and you get chattering, then put some modifier in, but in very small amounts untill the chattering goes away.





Wayne

amsoilman

 

[Joseph Donnelly]

You could also ask MagHytec what they find to work well.

 

[Pit Bull]

Originally posted by Joseph Donnelly

You could also ask MagHytec what they find to work well.

Joe, what lube do you use in your truck?

 

[Lordsman]

Lube

Hermann,

" No need for friction modifier according to Amsoil" and " Amsoil synthetic is almost too slippery" this info from issue 32; page's 88-90. By the way, you are real close to me. I wouldn't mind checking out you rig. E-mail me if you don't mind.

 

[Rob Thomas]

Hermann,



I was just readin' your sig. , do you have a Cummins or a Cummings, E-brake?





Later, Rob

 

[Pit Bull]

Originally posted by Rob Thomas

Hermann,



I was just readin' your sig. , do you have a Cummins or a Cummings, E-brake?





Later, Rob

Oh no now that we have spell check you guys want us to use it???

 

[A Hermann]

Originally posted by Rob Thomas

Hermann,



I was just readin' your sig. , do you have a Cummins or a Cummings, E-brake?





Later, Rob

Thanks Rob. I do know the difference

 

[klenger]

I use Amsoil 75-140 with no modifier. The Mag-Hytech sure is purdy.

 

[Vaughn MacKenzie]

I think 75W140 is overkill, I use Amsoil 75W90 with great results. Last time I changed it I went 30K+ and it was so clean I think it was a waste to change it. Also there was only a mirco thin coating of very fine metallic residue on the magnet, hardly enough to cover the butt end of a pencil eraser (not counting the sides!). I'm running the stock cover.



Vaughn

 

[CRSmith]

What is Chattering??

I've heard of chattering every time the subject of changing lube comes up. Is this the tires chirping due to the limited slip engaging due to lack of friction modifier. Or, does the sound come from the differential itself. Please describe.

Thanks.

 

[amsoilman]

reduaram,

"Chattering" is something you feel in the differential as you turn tight corners. This is usually caused by the clutches and disks grabbing in the LSD mechanism inside the differential.





Wayne

amsoilman

 

[BLee]

I put Mobil 80W140 synthetic in my Dana 70 about 8M miles ago when we installed the Mag-Hytec. No friction modifier. Made the figure eights, then towed the fifth wheel 150 miles to an Arkansas lake. When I got over into the campground, while making hard turns with the fiver weight still in the bed, I noticed a klunky, chattering sound from the diff. Came home and added one bottle of modifier, 4 oz, I think. No more chattering. The wear in that diff with this synthetic is nil. If ya let it sit and cool down, the difstick comes up with a little bit of very fine wear particles which look like graphite. I think the differential will outlast the truck.

 

[Pit Bull]

What's this about the lube needing to be MT-1? Is Amsoil and Mobil 1 MT-1 lube?

 

[John Berger]

To Vaughn and amsoilman

Why do you think the 75W-140 is overkill? I've been using it in my differential for over a year and it has been remarkably consistent. I've used the Series 2000 stuff exclusively since I added the Mag-Hytec. I put close to 39K miles on the Series 2000 75W-90 and had very good results with it. For heavy towing in the heat and humidity down this way, I felt better going to the heavier lube. Just curious.



John

 

[jsnyder]

If you are pulling a heavy load in the summer, I don't think the 75-140 would be overkill. For empty or light loads, it probably is.



I am running Lubrication Engineers synthetic 75W-140 due to the temperature extremes I tow in.



Jason

 

[JJW_ND]

75W90 does just fine for heavy pulling!

I have had excellent luck with the Series 2000 75W90. I have pulled extreme loads in summer heat many times. Sampled every time I have changed. While the lube does not last for ever (about 45 - 50K TAN is getting up their) the wear metals are almost non existent.



I have 220K on my Dana 80 LSD with 40 - 50K fluid changes. The LSD is as tight as the day it was new.



I know the specs say the 85W140 has as good a cold weather properties as the 75W90 but I would guess the lighter fluid is much thinner in very cold temps similar to 15W40 full synthetic engine oil versus 5W30 engine oil. Big difference with the engine oils.



jjw

ND