at least if you drop the oil to change, you'll soon find out if there's bits of gearbox in the oil. Now it was just serviced and you noticed it straight away. If you didn't do the service like I'm assuming, then I would be very displeased with your mechanic. I would also assume that the box would cruch all/most of the gears if it were due to incorrect weight oil being used.

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No more GC8, sad face.
[SIGPIC][/SIGPIC]