A report in one of the SAE International journals about a year ago(?) indicated that the introduction of new materials in auto manufacturer had reduced (and/or changed) the way that new cars smelled, so some manufacturers were investigating "odorizers" to add "new car smell" artificially - to respond to complaints from buyers.

Niche market suppliers have offered products to "renew" the "new car smell" in used autos for several decades, although reports from individuals who tried some of them (several years ago) weren't too enthusiastic. I haven't heard whether used car dealers still use the stuff much.

John