MILFORD, MI – The third time is a charm, as the saying goes. For General Motors Corp.’s Cadillac Div., it’s definitely true. The ’05 STS midsize sedan, which replaces the Seville, is the third all-new vehicle based on GM’s luxury rear-wheel-drive/all-wheel-drive Sigma platform. The ’05 STS is Cadillac’s best effort in years. The CTS entry-luxury sedan was Sigma’s debut and has been a huge sales hit. (The CTS-V performance version is only adding to the buzz.) The SRX cross/utility ...

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