I found Lucas 75W90 on sale for 11.00 a quart. ( Pepboys) Cheaper than anything else ECS tuning has. ( liquid moly) my understanding that even though it has friction modifies. Which the highly recommended Redline does. That it should be fine for use in a open diff like our E70s?

https://www.pepboys.com/lucas-oil-75...roduct/9166888