+1 on Zerex, And hold onto your seat...
Walmart brand full synthetic supertech engine and transfer case oil! Cant beat 5 quarts for $15.99 and its done well on oil tests.
How long have been using supertech? I can't imagine it would be terrible, just wondering how it works out over 100,000 miles or more.
Also, have you considered Amazon's brand of oil? It's cheap as well and from the same factory as Supertech.