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The 2010 Subaru Forester requires API GL-5 75w-90 oil for manual transmissions and Subaru ATF Idemitsu ATF hp "Dexron iii" for automatic transmissions. It's recommended to change the transmission fluid every 80,000 miles to prevent metal shavings and other contaminants from damaging the transmission, which could shorten its lifespan. To maintain proper functioning, it's crucial to check the transmission fluid level regularly between service appointments. This involves pulling out the transmission dipstick while the engine is warm and running, with the transmission in park.
The 2010 Subaru Forester requires API GL-5 75W-90 oil for manual transmissions and Subaru ATF Idemitsu ATF HP for automatic transmissions, which is equivalent to Dexron III Type Automatic Transmission Fluid.
I suggest using SUBARU ATF IDEMITSU ATF HP, which is a type of Automatic Transmission Fluid reminiscent of "Dexron III.