im sure this has been asked but I have a 2006 lr3 hse with locking rear diff and id rather run red line oil or another full syntthetic oil and I cant find what to run in the diffs or tcase has anybody tried anything else than the lr oil..

 

According to the Redline website, they specifically recommend 75w90 GL-5 gear oil for the diffs, but I don't know if that applies to a locking rear diff as well. The website also says they don't have a transfer case fluid that meets the Shell spec for the LR3.

 

Royal Purple is just fine.