I've not heard anything bad about Redline in ZFs. But keep in mind that our ZFs do not normally have any yellow metal inside them- usually referring to the sacrificial bronze or brass synchro rings in many American transmissions. ZF uses all-steel synchro rings that last much longer than brass. There were a few brass ZF synchro rings produced or adapted by unknown shops some years ago, but I haven't heard about them in awhile.
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