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Member
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Join Date: Mar 2020
Location: Corpus Christi, TX
Posts: 75
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Member
Join Date: Mar 2020
Location: Corpus Christi, TX
Posts: 75
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A "sealed" unit is a misnomer, they have to get fluid in and out somehow. The notion that changing transmission fluid at "high mileage" causes damage is also incorrect, and shows that whomever propagates that myth doesn't understand how autos actually work. Long story short, changing your transmission fluid won't damage your transmission, but it could expose any slippage that was being masked by the old fluid. Old fluid -> more friction -> less slipping. New fluid -> less friction -> more slipping. Again, what causes the slipping is wear in the transmission, not a property of the fluid.
Have your fluid and filter changed. It may not be relatively cheap, but it will ensure your transmission lasts (at least) another 100k miles. There's no reason to believe your current fluid would be masking any wear-caused slippage in your transmission.
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