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1991 Range Rover 170K miles

Several people have suggested better mileage with synthetic lub in differentials. Since mine hasn't been changed since 63K I thought I might look into it.

Then I read http://www.okierover.com/cv-joint.htm & thought about doing swivelhousing also. (Owners manual say every 30K for all these.)

Now I'm ready to do it. My 1997 Tahoe could use same treatment, it has minor leaks on rear seals.

I'm inclined to use Redline 75W/80 (LightWeight).

Suggestions anyone ?

Does it really increase mileage ? Anyone document this ?

Also any increase in leakage due to somewhat thinner oil ? Any additive sugeested to stop leaking?
 

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I'd love to be in the Rat Patrol
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If the viscosity is 75W90 how is it "thinner" than conventional oil's 75W90?
I thought the viscosity was the measurement of the "thickness" under certain temperatures.
I may be wrong but I would like to know.
 

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Lightweight oils are used in mechanics with tighter tolerances than LRs. Only consider using them if you operate only in very cold conditions where EP90 would become too thick.

The swivels run well on the 1-shot grease sold for this purpose at LR suppliers.
 
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