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its not essential but its there so that if the gear oil gets real hot n expands alot, the excess gas/oil can flow up the pipe without overflowing. once cooled back, the excess can flow back in.works exactly the same as the coolant expansion tank
its not essential but its there so that if the gear oil gets real hot n expands alot, the excess gas/oil can flow up the pipe without overflowing. once cooled back, the excess can flow back in.
works exactly the same as the coolant expansion tank