Have you considered 'Young Blood' by The Naked And Famous? While it doesn't have a whistle throughout, it's been mistaken for those that do because of its synth sounds. The indie scene of a few years back had quite a number of tracks with distinctive whistle sections – 'Janglin' by …

Tracking down old jingles can be a bit of a treasure hunt, but so rewarding when you find them! Start with reaching out to local radio stations or checking their archives – some keep old recordings. You might also try contacting the dealership directly, sometimes they keep old marketing material. …