Fella's,
Lately, the manual gearbox of my Nissan sometimes emits a soft scraping noise when idling in neutral and the clutch pedal up. Noise disappears when clutch pedal is pressed.
I reckon it's a bearing of the primary shaft.

I was wondering if adding an additive based on PTFE or Molybdenum Disulphide will help to quiet the bearing. I realise it won't cure the underlying problem, but it may postpone an expensive repair for the time being.

What do you think?

THANKS

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2011 Prius