We could remove the TDI model designation, and push everyone back onto normal Jettas with the proper engine, and then in the future we could block someone from creating a TDI new model and it won't be available to everyone.
For custom car models, we approve them by hand, and one of us site admins accidentally approved "TDI" as a separate model at some point months ago.
I think we'll align everyone and fix this up next week sometime.
pb 
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