Roy Butfoy, the master rebuilt my ZF 20 years ago. As I was leaving Lance's shop, he looks at me and says "change it once a year, and use Castrol 80W90 Hypoy C." Use nothing different, and never do not change it once a year."
I never forgot what Roy told me and I have faithfully done that. Roy didn't say GL-5. He just showed me the bottle and said buy this.
I live in SoCal, and my ZF shifts like butter, does not leak and is perfect.
So that is what I choose to use.
Lee
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