The code is not Goodyear specific; it is a DOT standard. Look at the last 3 or 4 digits of the DOT code. They indicate the week and year of manufacture. For example, my tires codes end in 0405, indicating the 4th week of 2005. for older tires only a 3 digit date code was used, something like 229, meaning the 22nd week of 1999.
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Steve B.
05 Journey 36G CAT C7
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