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ATF Detergent Level and Usability in Older Transmissions
 
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Question:
ATF Detergent Level and Usability in Older Transmissions
I have a 2000 Chrysler Sebring Convertible with 172,000 miles. I've never changed the transmission fluid. I was thinking about putting Mobil 1™ Synthetic ATF in it, but the dealer advised against it. He said that there was too much detergent in it and it could harm an old tranny like mine. Is there any validity to this?
-- Mark Puttre, Randolph, NJ
Answer:
In general, changing the fluid should only help the transmission operate better. If the fluid is very old, it may make sense to use the new fluid for a few thousand miles, then change the fluid again, and clean the pan and tranny filter. Be warned though, if you have transmission problems already, changing the fluid may or may not help the performance.
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