I found Castrol HYPOY C 80w-90 Gear Oil at Pep Boys,Part # 12609 SKU: 8078227 for $2.90/qt
http://www.altaso.com/google_s...QTnC6v92yAMUq9qplbew
$2.90/QUART is an is an unbelievable price!
I think ZF capacity is 3.75 quarts
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