ARB synthetic gear oil recommendations?

[saburai]

Hi Gang,

I've got around 1200 miles on my new lockers in the XJ, time to dump the dino juice and get some synthetic oil.
As a wandering Nomad I'm in SW Florida and like the fool that I'm, the ARB manual is in N.Y.
I looked on the ARB site and they recommend Shell 90wt. for highway/light off road and Spirax 85-140 for heavy off road/high HP high torque use. The local speed shop here stocks Royal Purple 75-90, 75-140 and 85-140. I'm limited to this as, as usual I'm pressed for time and a place to work on my rig so I gotta do it Monday or Tuesday at the latest...
The XJ is fairly loaded down with a RTT, Jerry cans, spare, heavy bumpers, winch armour, tools etc, etc. The truck is running the D30/Cryco 8.24 combo with 4.10 gears and 31" tires and I do do a lot of highway driving at around 70mph or so.
Recommendations? Thoughts?

Many Thanks!

 

[charlieaarons]

This is very good synthetic oil. Pick the viscosity according to your projected climate and preferences; but 75W90 will give 2-3% better fuel economy, and that's what I'd use:
http://www.mobil.com/usa-english/lu..._delvac_synthetic_gear_oil_75w-90_80w-140.asp
Or visit the Redline site:http://www.redlineoil.com/Products.aspx?pcid=4
Those would be my top choices for synthetic gear oil. I use the Delvac 75W90 in my Unimog, Mercedes specifically recommends it:
http://bevo.mercedes-benz.com/bevol...th=bevolisten&blatt=235.8&content_action=show

Royal Purple is IMHO overpriced and advertised for more than what it actually is. In the world of "boutique oils", Redline is considered far superior; reference the BITOG forum.
If you absolutely have to use Royal Purple (you can buy Mobil products at a Mobil distributor, there is at least one in any medium sized city), use the 75W90.
http://www.host.exxonmobil.com/chan...butor_directory_state.jsp?distributorState=fl

Charlie

 

[juicexj24]

I give another vote for Mobil 1, I have run it in my diffs for 5 years or more. My XJ has an ARB in the D44 rear with over 15k miles on it all of which has been with Mobil 1. My 2 WJ's both have Mobil 1 75/90 in them as well. Royal Purple is overpriced to me, Mobil 1 in the diffs, t-case and oil/filter and you can't go wrong. Juice

 

[pumapatrick]

+ 1 Redline

 

[tdesanto]

I'm using Redline