How do you keep the GU's 5sp shifting smooth as butter?
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First, check that the clutch is disengaging properly. It wouldn't hurt to bleed the clutch fluid to get any air out of the system.
According to the workshop manual, page nine: the manual gearbox requires a GL4 rated oil 75w90. GL5 is too sticky and causes the syncromesh to grab and grind. I hope, for your sake, that the vendor didn't put additives in the box to quieten it down for the test drive. There are some situations where the oil/additives used are tougher than the brass components and will cause the metal to erode.
My suggestion would be to drain the box and fill it with the correct oil and see if it runs better.
Last edited by mudnut; 18th February 2020 at 10:06 AM.
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