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What type of fluid does a 1990 ford tarus sho manual transmission require?

The 1990 Ford Taurus SHO manual transmission uses SAE 75W-90 gear oil. It's crucial to use gear oil, not motor oil. While some older manuals might suggest other viscosities, 75W-90 is the generally accepted and recommended modern equivalent. Always check your owner's manual for the manufacturer's specific recommendation.