[TR] Differential Gear Oil

[Randall]

> What is the best gear oil to use in a TR6 differential.

A matter of opinion; I don't believe there is any clear "best" as long as it
meets both MT-1 and GL4 or GL5.

> I am considering
> synthetic Mobil 75-90W. Any opinions pro or con?

Probably fine.  But a recent experience with Mobil 1 engine oil has
convinced me to stick with Valvoline full synthetic.
http://www.valvoline.com/pages/products/product_detail.asp?product=58

Randall