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The best way to find out would be to look on the Certification Label on the B piller of the drivers side door.
It should say EXT PNT: XX. Where XX will be your paint code.
Edit: You may really want to do that also. According to the code lookup at automotivetouchup.com, there's 4 different codes for White and/or Oxford White.
actualy it will be YZ, dont make me go take a pic of my door tag on my truck to prove it..
i paint fords all day long. trust me Z1 is the newer pure white color..
Z1 is a cleaner/brighter wihte compared to YZ which tends to look dirtier/yellower compared beside it..
Well I apologize if Ford's own source books are wrong, but then how would you explain a '99 SD that is Oxford White with the code Z1 on the VC label if it is the "new" code for Oxford White?
No need to take a picture of your VC label either as I believe you that your '03 F-250 Oxford White is YZ as that is what it is supposed to be.