As I understood from thread name it is a common thing, so maybe it's that 5th gear hub problem? I may be wrong

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I saw several discussions on USA forums about gear grinding in general. People was discussing about different brand oils, witch helps more. Then came couple guys, who builds gearboxes. One from Synchrotech, other form don't remember where. And explained, that if there's grinding, you need to change synchros or other parts. Oil just may cover the problem for a little while. It's completely logical for me and I think it's true

One more thing to add from my knowledge (don't know how much true), from the same thread I think, o maybe other, that oil can cause problems to Honda gearboxes. Don't use too think one, that really can cause grinding especially then oil is cold. I myself use Honda MTF-3 all the time.
Hope this helps, if this thread is about this problem at all
