My owners manual says that I have 16.4 qt. of transmission fluid in my '97 5.4L Expy.

When I inquired about a transmission fluid & filter change at a service shop, The check-in technician scoffed at this volume. He said that I would only need about 6 qt. in a routine fluid and filter change and that the rest of the volume would remain in the torque converter.

Which is correct?

I have 45K miles now and would like to switch to Mobil-1 synthetic transmission fluid for towing purposes. I have misgivings of leaving 10 quarts of old fluid behind if the normal practice is to only change 6 qt.

Thanks for the feedback...

Dino F.

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