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Damn this thread is old but I'll add
Owned my Kaaz 2 way now for about 10 years(S14, 4.08, w/high-capacity Greddy diff cover so it's about 2.4L of fluid), changed fluid every other oil change(so about every 6,000 miles of driving), making sure to use NON-SYNTHETIC 80w-90 gear oil and bottle Ford friction-modifier.
I usually end up using Valvoline since I can find that in a 4Qt/1 Gallon size. Having the extra-capacity diff cover made it challenging to find that Kaaz gear oil is so expensive and basically doubled the cost if I bought/used Kaaz oil. I have found 0 issues with my choice of oil in my diff and it's operations in past 10 years.
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