Differential oil?

[RDedrick]

I just got my new Mag-Hytec differential covers for the rear and front axle. I was wonder what kind of oil everybody is running in them. From what i have found the oil from mopar is $$. I use my truck for dayly driving and pulling my 27 ft. 5th wheel which is about 9000lb loaded. Any info. would be good.

 

[roperteacher]

Amsoil Severe gear 75/90, 110, or 140 is all I use!

 

[HPetrat]

Redline heavy - duty Shock proof for the last 5 years.



HP

 

[RRees]

Valvoline 75/90 Synthetic.

 

[Buffalo]

I'm using the Red Line 75-90. Was able to get it for $7. 00/qt. , here in Phoenix (directly from the local distributor. Much cheaper than the factory fill. )

I, recently, read that the Amsoil Severe Gear was rated the best in a gear oil test. I think it was an independent test @ bob is the oil guy.com.



Joe F. (Buffalo)

 

[Ducman82]

i used Royal Purple max gear works great!

 

[BGarofalo]

Royal Purple has my vote.

 

[JGheen]

I use the Mobil 1 75/90 and it has been great. Extended my service intervals to 30-35K instead of the factory 15K. Gets kind of expensive being $10 per quart and 8 needed to fill the rear with the MAG cover.



Joe

 

[MoparDave]

Royal Purple here

 

[amsoilman]

Check out this website:

AMSOIL - A Study of Automotive Gear Lubes



There are many differences. Look at the "Viscosity Before and After KRL 20-HOUR shear Stability Test" Lucas 75W-90 and Royal Purple 75W-90 were thicker than a 90 before the test, but were thinner after the test. Infact, Royal Purple was the only gear lube to fail both the initial Viscosity requirments and the shear stability requirements. It lost 40. 6% of its Viscosity during the 20-Hour test!

 

[DE Jeeper]

Use Mobile 1 and change every 50k. Always looks nice, but I have never tested it.



Aaron

 

[CLynch]

Amsoil Severe gear 75/90 in front, 75/110 in rear.

 

[MAleshire]

I use Amsoil 75/90 in front, and 75/110 in the rear. I tow a trailer similar in weight to yours. I talked with an Amsoil tech who recommended the above weights given the amount of towing I do (about 15-20% of my driving is while towing). If you are going to tow more than that you should consider the 75/140, particularly during hot summer months.



Skip

 

[seafish]

Are there really any substantial benefits to using 75/90 in front and 75/110 in the rear? Why not just 75/110 front and back to simplify things?? Would'nt one still get great protection with no side effects?? Afterall, doesn't the viscocity change mostly according to operating temperature??

 

[MMeier]

Lubrication Engineers LE 607 in all my diffs.

 

[MAleshire]

Using 75/110 all around probably wouldn't make much difference. The 75/110 is just a little more expensive. There are members of TDR that are Amsoil dealers, maybe they could share some wisdom here.



Skip