What happens when you add too much ATF?

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Thread: What happens when you add too much ATF?

  1. #1
    Registered User GoLowDrew's Avatar
    Join Date
    Jun 2009

    What happens when you add too much ATF?

    No, I'm not going to overfill it on purpose. Just wondering if there is any harm if one adds too much.

    Motor oil, for example when you overfill it, will boil over and/or foam up. So that's not good.

    Will ATF do something similar?

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  3. #2
    Registered User
    Join Date
    Apr 2010
    Montreal, QC
    Too much ATF will foam up, so the transmission can slip - this happened to me in a previous car. I think the slipping may not be good for the transmission, as it probably means extra wear on some parts...

    Also, it has happened to me in another previous car where the ATF started coming out of a vent on top of the transmission and dripped on the exhaust, creating a lot of smoke.

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  4. #3
    Registered User
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    Dec 2009
    Quote Originally Posted by nicomtl View Post
    the ATF started coming out of a vent on top of the transmission
    Usually this
    2007 EX-L

  5. #4
    Registered User 0dyfamily's Avatar
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    Jun 2006
    SW OK on the Red River
    I saw a guy's Ford Explorer do the spilling out the vent deal do to an ATF overfill. It leaked onto the exhaust pipe and ignited

    ATF is supposed to do everything, as in hydraulic torque transmission, operate hydraulic power circuits, perform heat exchange and lubricate bearing surfaces and gear faces. It can only do this if it is in a pure liquid state. Air entrained ATF (foam) does none of these well. One can possibly damage many things in a transmission due to an overfill.

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