It's hydrolic fluid to control the blade pitch https://leadstories.com/hoax-alert/2020/10/fact-check-wind-turbines-do-not-need-oil-changed-every-500-hours-some-can-go-years.html
It's hydrolic fluid to control the blade pitch https://leadstories.com/hoax-alert/2020/10/fact-check-wind-turbines-do-not-need-oil-changed-every-500-hours-some-can-go-years.html
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