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I'll bet that 15 year old car had natural leather seats. Modern cars (except for maybe a few high end models and Euros) do not have natural leather but rather, coated or "treated" leather. This is a protectant that prevents spills and other accidents from being absorbed by the leather.
Products such as leatherique and lexol, need to "feed" leather in order to be most effective. In other words, they must be absorbed by the leather to work. As long as the "coating" is on the leather and working, very little of the conditioner will in fact be absorbed. The best thing to use on treated leather is a UV protectant that has been approved for leather - just like your 303 which is probably the best product at what it does. Just put it on everything inside, except fabric, and you are set to go.