Turns out the 7th/8th character change was part of an overarching effort to expand VIN variety:
In a letter dated October 31, 20054, the SAE Vehicle Identification Number/World Manufacturer Identifier Technical Committee5 petitioned NHTSA to make certain changes to the current VIN system. The committee proposed “minor revisions” to Part 565 that it believed would both preserve the current 17-character VIN format while significantly expanding the universe of available unique manufacturer identifiers and VINs.
These changes enacted for MY10:
The petitioners further proposed that these changes take effect beginning with the 2010 model year due to concerns over the supply of manufacturer identifiers and the possibility of duplicate VINs being issued beginning with that model year.
The change that broke Audi putting the actual type value in the VIN:
• Require that VIN position 7 be alphabetic for passenger cars and multipurpose passenger vehicles and trucks with a gross vehicle weight rating of 4536 kg. (10,000 lbs.) or less (This position currently must be numeric for these vehicles. Either an alphabetic or numeric character can be used in this position for other vehicles covered by the standard);
Why they felt the need to not just let it be a number or letter is who knows. Gov't. You can read all about the VIN change in "VIN_Final_Rule_April_08.pdf", found via google search, if you're really really bored one day.
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