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Reminds me of years ago when someone told me that adding something to their oil (Z-max I think) and it dropped the engine RPMs substantially for the same vehicle speed. He couldn't explain how engine oil additives made his clutch stop slipping (manual transmission).
I'm skeptical of most additives, but especially anything that involves wet clutches like automatic transmissions. If it makes things more slippery too protect bearings and gears, the clutches may slip. If it improves friction on the clutches, what is that doing to the bearings? About all the additives can reasonably do on an auto transmission is increase detergents to clean out the valve body & solenoids or add something that swells the seals which I wouldn't want unless the transmission is failing anyway.
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