How's Wal-Mart ST 75W-90 Syn blend?

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I have searched, but could not find much info on it? I know about the lawsuit a while back. How is it now? I won't be changing it again for 4 years/25K miles (yes your read that right). Last differential service was 4 years ago and I put only 25K miles on that oil. It was done by Isuzu dealer, so I am sure they used Castrol something.

Oil will go into Rear LSD (with a tube of LSD Additive), front and shift-on-the fly. Transfer case is getting M1 Mercon V/Dex 3--already had it on hand.
 
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I would not use it after they got caught selling sub standard gear lube. Mobil1 has the LSD additive in it so by the time you add the cost of the additive are you really saving anything?
 
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