The gear oil in mine was original (11 years/130,000 miles) when it finally got replaced when i did the clutch. It was pretty rancid. It seems a little happier for it since. I used some cheap semi synthetic GL4 75w90 gear oil. No issues so far. I will probably replace it at 200,000 miles which should be in 2021. I would have replaced it at 110,000 miles but i knew i was going to be doing the clutch soon so i thought it best to wait.
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