I had my transmission oil changed on my 2009 Spectra and in the parts list for the fluid it is marked 18. The cost was $5.58 w a total price of $100.44 for Synthetic DEX VI fluid.
If the did a flush it would about 7 quarts to refill, if just the pan was removed it would be about 3 quarts, not sure what 18 is but the car calls for SPIII fuild/ http://www.kia-forums.com/cerato-2003-2008-spectra5-2004/49577-warning-many-kia-owners.html
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