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Transmission oil

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I have a question for the experts who know these old machines. My Roticul tiller manual says to only use a special Simplicity factory gear oil in the transmission. I have no idea what the original oil may have been--90w, motor oil...etc. Most tractor hydraulic oil and old lubricants have been replaced by 'tractor fluid'. What should I use in the transmission? I'm thinking 90w because the thing is so old and the gears are a little noisy. Any help will be greatly appreciated! Thanks, Jim.

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