Going to nominate two
- Late model Toyota's - haven't had a chance to listen around lately but I still remember the distinct Toyota starter sound when I had my old Toyota pickup and my other half had a '01 Celica and spent some time in the service bays. This was around the time the 97-2001 Camry was still the current model, seemed like every Toyota during that time period had the same starter as you could never tell what car it was until the engine started running.
- Mid-late 90's Chrysler V6. They all had that clean high pitch whine and it just sounded so precise. Unfortunately the cars built around the starters were not particularly precise and were almost utter junk.