Which Amsoil for Dana 70?

[rblomquist]

I'm going to swith to Amsoil in the rear end but was wondering which one is the best match for what Dana calls for?



Series 2000 75-140

Synthetic 85-140



There's no way I can get by using 75-90 between the weights I tow and the summer heat here so it's down to one of the two above.



Thanks

 

[Rman]

I'd opt for the series 2000 75-140. It's expensive, but should last some time. I'm on a 50k interval.

 

[amsoilman]

IF it were mine, I'd install the Series 2000 75W-90. I have a couple of OTR (Over The Road Truckers using this product, and they have been very happy with it. This is the same product I have used in the 3 CTD pickups I have owned.



Just my . 02 worth.



MERRY CHRISTMAS



Wayne

amsoilman

 

[Loren]

I'm using the series 2000, 75W-90 in all my differentials. I didn't see any reason to go to the 140 weight stuff.



I intend to change the rear fluid about every 60,000 miles or so, and will probably never change the front differential oil again.



Even if you put the 140 weight in your rear differential, 4WD owners should consider using the lighter weight oil in the front one. That axle is rarely engaged (for most of us) and it's often cold out when we use it.



I've been happy with the series 2000. I don't think you can go wrong with any of the brand name synthetics.



Loren

 

[rblomquist]

I thought DC recommended 85-140 if vehicle is used for towing. I tow a 10,000lb + travel trailer year round. That means in Jun-Jul-Aug there are times when I'm towing it in 110 degree + weather. I can't see 90w holding up too long in those conditions.



What I'm really wondering is what GL rating DC/Dana recommends for the 70 rear end. The series 2000 and the regular synthetic are rated for different GLs.



Thanks much.

 

[amsoilman]

The Amsoil Series 2000 75W-90 has a GL-2 through GL-5 rating, which simply says it can be used in most any gear application other than a GL-1, which is generaly considered as an engine oil.



The numbers associated with the service classification typiclly denotes the level of application severity. There used to be a GL-6 rating, but it is now obsolete.



Dodge recommends a GL-5 lubricant.



Wayne

amsoilman

 

[BillGotthelf]

I don't know why you think the 75-90 won't hold up. I pull 14,000 lbs in fla in (96 3500 4x4) summer to mountains and run it. I have never had temp go over 190 in rear. I can't see synthetic gear lube breaking down at those temps. I even run it in my 99 and had the limited slip clutches last almost 110,000 miles with major HP and I don't add friction modifier.

 

[dieselburner]

I run the amsoil series 2000 85-140 in both diffs...