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Tough call. If you want to keep the car for a significant amount of time, I'd look into changing the fluid slowly. Like 1 quart at a time. It's wasteful of fluid, but it scratches the "gotta do something about it" itch, and won't damage the transmission since you're introducing new fluid slowly.
If you want to get spendy with additives, look into Auto-RX. It's a great cleaner that's not a solvent.
A Magnefine transmission filter could help, too. Then you'd be catching the particles in the ATF, and at least have clean old ATF.
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2012 Chevrolet Cruze Eco 6MT
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