As I change gears I have noticed the gear box feels a bit "clunky". I understand that the vehicle's mileage is high but it runs very well besides this so I wanted to know if there is an oil additive i can add to the gear oil that might tighten thing up a bit? Or would you recommend changing the gear oil to a more viscous grade? The gear oil was dropped just last year.
My car has 200000 miles.
My car has a manual transmission.
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