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Toyota recommends using 75W90 gear oil whenever you need to refill your rear differential. It's important to change this oil every 30,000 miles to safeguard the gears located there. The rear differential is the final set of gears that transfer power to your rear tires. Due to its compact size, a thicker oil is utilized to withstand the heat and pressure in this confined space more effectively than a thinner oil. If you observe any leaks from your rear differential, it's crucial to address them promptly to prevent gear grinding and damage resulting from low fluid levels.
The manufacturer suggests replacing the rear differential fluid every 30,000 miles using 75w0 synthetic oil.