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I changed it my saw once but that was 15 years ago. Other then that, no, not on any of our saws. We use them to do finish work too but those do not get beaten too much. The one thing we make that's still quality and robust is the Skill Saw. On the Makita, they use hypoid gears that do not require oil change. I believe they are sealed. We still have our old Makita and it cuts just about anything anytime.
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